Computed Tomography Radiation Dose Reduction: Effect of Different Iterative Reconstruction Algorithms on Image Quality
Objective: We evaluated the effects of hybrid and model-based iterative reconstruction (IR) algorithms from different vendors at multiple radiation dose levels on image quality of chest phantom scans. Methods: A chest phantom was scanned on state-of-the-art computed tomography scanners from 4 vendors at 4 dose levels (4.1 mGy, 3.0 mGy, 1.9 mGy, and 0.8 mGy). All data were reconstructed with filtered back projection (FBP) and reduced-dose data also with IR (iDose4, Adaptive Iterative Dose Reduction 3D, Adaptive Statistical Iterative Reconstruction, Sinogram-Affirmed Iterative Reconstruction, prototype Iterative Model Recons...
Source: Journal of Computer Assisted Tomography - November 1, 2014 Category: Radiology Tags: CT Physics and Technology Source Type: research

Computed Tomography Radiation Dosimetry: From the Indicators to the Indications
Abstract: The technological advances in computed tomography (CT) scanners and their continuously increased use have raised concern about the patient-induced risks from the CT procedures. In the present review, all available dose metrics used in CT dosimetry are described, evaluated, and compared. The various models and methodologies currently existing for the estimation of the effective dose and, by extension, the carcinogenesis probability as well as the way that this is derived from dose descriptors are also considered. (Source: Journal of Computer Assisted Tomography)
Source: Journal of Computer Assisted Tomography - November 1, 2014 Category: Radiology Tags: CT Physics and Technology Source Type: research

Procedure-Oriented Sectional Anatomy of the Ankle
This article reviews the anatomy of the ankle and its relationship to procedures in the clinical setting with or without ultrasound guidance. Anatomically correct axial and oblique axial schematics allow injections to be envisioned relative to clinically important anatomy for common ankle procedures. Cross-sectional schematics for the ankle were drawn as they appear in imaging projections. The levels and planes of cross section were selected to highlight important anatomic landmarks for injection. It is hoped these schematics allow for safer and more accurate needle procedures in the ankle area. (Source: Journal of Compute...
Source: Journal of Computer Assisted Tomography - November 1, 2014 Category: Radiology Tags: Graphic Anatomy Source Type: research

Effectiveness of Additional Diagnostic Parameters in Magnetic Resonance Mammography: A Comparative Study with the BI-RADS Classification and Scoring System
ConclusionsAdditional parameters can improve the specificity of MR imaging. T2-weighted signal features, adjacent vessel sign, unilateral-focal edema, and hook sign were considered as effective parameters. (Source: Journal of Computer Assisted Tomography)
Source: Journal of Computer Assisted Tomography - November 1, 2014 Category: Radiology Tags: Thoracic and Breast Imaging Source Type: research

The Effect of the Section Thickness Used for 2- and 3-Dimensional Quantification of Dual-Energy Perfusion Computed Tomography
PurposeTo retrospectively investigate the effect of the section thickness used for quantifying dual-energy perfusion computed tomography (DEpCT) during 2- and 3-dimensional evaluation. MethodsSixty-six patients (22 males and 44 females; mean age, 59.3 years) suspected of having an acute pulmonary embolism underwent DEpCT, and 15patients were diagnosed to have intrapulmonary clots (IPCs). Two-dimensional DEpCT images were reconstructed into various section thicknesses from 1 to 10 mm at the main pulmonary artery, and the ratios of the low attenuation area (LAA) ranging from 1 to 5 HU (%LAA5) and 10 HU (%LAA10) on DEpCT were...
Source: Journal of Computer Assisted Tomography - November 1, 2014 Category: Radiology Tags: Thoracic and Breast Imaging Source Type: research

Nontuberculous Mycobacterial Pulmonary Infection in Patients With Idiopathic Interstitial Pneumonias: Comparison With Patients Without Idiopathic Interstitial Pneumonias
ObjectiveThe aim of this study was to describe computed tomography (CT) findings of nontuberculous mycobacterial (NTM) pulmonary infection in patients with idiopathic interstitial pneumonias (IIP) in comparison with those in patients without IIP. MethodsFrom November 2001 to October 2012, 810 patients in the NTM registry were retrospectively reviewed. Among them, 42 patients (mean age, 69.7 years; 32 men and 10 women) who were diagnosed as having IIP by either histological or radioclinical criteria were included in our study. Eighty-two age- and sex-matched immunocompetent patients with NTM pulmonary infection and without ...
Source: Journal of Computer Assisted Tomography - November 1, 2014 Category: Radiology Tags: Thoracic and Breast Imaging Source Type: research

Quantitative Computed Tomography Assessment of Air Trapping in Relapsing Polychondritis: Correlations With Spirometric Values
This study included 23 patients with RP who underwent both CT and PFTs. In each patient, the mean lung density (MLD) was obtained by averaging CT attenuation of the lung parenchyma on both inspiratory and expiratory CT. The ratio of expiratory MLD to inspiratory MLD (E/I ratio) was also calculated. Correlations between those quantitative CT measurements and the results of PFTs were evaluated using Spearman rank correlation. ResultsThe expiratory MLD and E/I ratio were significantly correlated with forced expiratory volume in 1 second (FEV1) %predicted, ratio of FEV1 to FVC (FEV1/FVC), and the mid expiratory phase of forced...
Source: Journal of Computer Assisted Tomography - November 1, 2014 Category: Radiology Tags: Thoracic and Breast Imaging Source Type: research

The Cost of Screening Esophageal Varices: Traditional Endoscopy Versus Computed Tomography
ConclusionComputed tomography has been shown to be sensitive in detecting esophageal varices and now less costly to implement in screening. The cost of esophageal rupture in endoscopy and the less costly risk of contrast reaction as well as radiation exposure in CT of the abdomen should be considered when developing a screening paradigm. (Source: Journal of Computer Assisted Tomography)
Source: Journal of Computer Assisted Tomography - November 1, 2014 Category: Radiology Tags: Thoracic and Breast Imaging Source Type: research

Effect of iDose4 Iterative Reconstruction Algorithm on Image Quality and Radiation Exposure in Prospective and Retrospective Electrocardiographically Gated Coronary Computed Tomographic Angiography
ConclusionsThis study demonstrated that the application of iDose at CCTA facilitates significant radiation dose reduction by maintaining diagnostic quality. The combination of iDose4 with prospective acquisition is able to significantly reduce effective dose associated with CTCA at values of approximately 2 mSv and even lower. (Source: Journal of Computer Assisted Tomography)
Source: Journal of Computer Assisted Tomography - November 1, 2014 Category: Radiology Tags: Cardiac Imaging Source Type: research

Diagnostic Quality of Dual-Source Coronary CT Examinations Performed Without Heart Rate Control: Importance of Obesity and Heart Rate on Image Quality
ObjectivesFor dual-source cardiac computed tomography (CT) scans without heart rate (HR) control, the influence of body habitus on quality is uncertain. We evaluated study quality across a range of HRs and body size. MethodsOne hundred sixty subjects were randomly selected for 4 HR groups ( (Source: Journal of Computer Assisted Tomography)
Source: Journal of Computer Assisted Tomography - November 1, 2014 Category: Radiology Tags: Cardiac Imaging Source Type: research

Optimization of Free-Breathing Whole-Heart 3-Dimensional Cardiac Magnetic Resonance Imaging at 3 Tesla to Identify Coronary Vein Anatomy and to Compare With Multidetector Computed Tomography
ConclusionsFree-breathing whole-heart 3-dimensional MRI at 3 T provides high-spatial-resolution images and could offer an alternative imaging technique instead of MDCT scans. (Source: Journal of Computer Assisted Tomography)
Source: Journal of Computer Assisted Tomography - November 1, 2014 Category: Radiology Tags: Cardiac Imaging Source Type: research

Computed Tomography Features of Papillary Thyroid Carcinomas
This study aimed to evaluate CT features of PTCs and to compare the ultrasound (US) and CT features of PTCs. MethodsThis study enrolled 134 consecutive PTC patients who received neck US and CT examinations before thyroid surgery. For each case, US and CT features were retrospectively and independently investigated by a single radiologist using a picture archiving and communication system. ResultsOf the 120 PTC cases, 106 were detected by CT, but 14 were not visualized. In each CT category, the most common feature included low attenuation, homogeneous attenuation, a taller-than-wide shape, no calcifications, decreased enhan...
Source: Journal of Computer Assisted Tomography - November 1, 2014 Category: Radiology Tags: Neuroradiology Source Type: research

Diffusion-Weighted Magnetic Resonance Neurography for Parapharyngeal Schwannomas: Preoperative Determination of the Originating Nerves
ConclusionsThe DW-MRN is a feasible approach for determining an originating nerve. (Source: Journal of Computer Assisted Tomography)
Source: Journal of Computer Assisted Tomography - November 1, 2014 Category: Radiology Tags: Neuroradiology Source Type: research

Evaluation of Selective Positron Emission Tomography Template Method for Spatial Normalization of Amyloid Imaging With 11C-Pittsburgh Compound B
ConclusionsUse of the SPT provides accurate normalization of amyloid images without MRI. (Source: Journal of Computer Assisted Tomography)
Source: Journal of Computer Assisted Tomography - November 1, 2014 Category: Radiology Tags: Neuroradiology Source Type: research

A Histogram-Based Similarity Measure for Quantitative Magnetic Resonance Imaging: Application in Acute Mild Traumatic Brain Injury
ConclusionsOur results show that HSM is more sensitive than the standard mean values in detecting brain tissue changes. Future studies on brain tissue properties using quantitative magnetic resonance imaging should consider the use of HSM to properly capture any tissue changes. (Source: Journal of Computer Assisted Tomography)
Source: Journal of Computer Assisted Tomography - November 1, 2014 Category: Radiology Tags: Neuroradiology Source Type: research

Neuroendocrine Tumors: Beyond the Abdomen
AbstractSeveral classification systems for neuroendocrine tumors (NETs) exist, which use variable terminology and criteria for grading and staging. This variability in terminology can cause confusion and difficulty in recognizing which tumors are, in fact, members of this heterogeneous group of malignancies. The largest group of NETs, the gastroenteropancreatic NETs, has been well described and characterized; however, there are less-recognized extra-abdominal NETs that can arise from nearly any organ in the body. In this article, the clinical features and imaging appearances of the extra-abdominal NETs will be reviewed, co...
Source: Journal of Computer Assisted Tomography - November 1, 2014 Category: Radiology Tags: Neuroradiology Source Type: research

Computed Tomography Imaging Manifestations of Commonly Used Materials in Posttraumatic Craniofacial Repair
AbstractAn expansive array of materials exists within the armamentarium of craniofacial surgeons. For patients undergoing repair of posttraumatic injuries, computed tomography is the imaging modality of choice in the postoperative setting. Therefore, radiologists will invariably encounter implants constructed with various materials, depending on the surgeon’s preference. The appearance of these materials on computed tomography is broad, ranging from hyperdense to radiolucent. To avoid misdiagnosis, radiologists should be familiar with all of the materials currently in use. (Source: Journal of Computer Assisted Tomography)
Source: Journal of Computer Assisted Tomography - November 1, 2014 Category: Radiology Tags: Neuroradiology Source Type: research

Local Magnetic Resonance Imaging Staging of Rectal Adenocarcinoma
AbstractSuccessful multidisciplinary evaluation of potentially resectable rectal adenocarcinoma depends on high-resolution preoperative magnetic resonance imaging (MRI). Magnetic resonance imaging accurately identifies important risk factors of local recurrence and distant metastasis, thus facilitating enhanced preoperative prognostic stratification and treatment. When combined with appropriate neoadjuvant chemotherapy and total mesorectal excision, the treatment of rectal cancer has dramatically improved. Accurate local staging by MRI requires a robust combination of imaging sequences. Herein, we review MRI imaging and re...
Source: Journal of Computer Assisted Tomography - November 1, 2014 Category: Radiology Tags: Abdominal Imaging Source Type: research

Magnetic Resonance Imaging Manifestations of Decidualized Endometriotic Cysts: Comparative Study With Ovarian Cancers Associated With Endometriotic Cysts
ConclusionsIn pregnant subjects, the presence of endometriotic cysts with low-height solid component showing high signal intensities on T2-weighted imaging is highly indicative of decidualization. (Source: Journal of Computer Assisted Tomography)
Source: Journal of Computer Assisted Tomography - November 1, 2014 Category: Radiology Tags: Abdominal Imaging Source Type: research

Intrapancreatic Accessory Spleen: Possibilities of Computed Tomography in Differentiation From Nonfunctioning Pancreatic Neuroendocrine Tumor
ConclusionsCT can be used to differentiate between IPAS and PanNET with good specificity and sensitivity. The IPAS mirrors the spleen’s enhancement and is usually located along the dorsal surface of the pancreas. (Source: Journal of Computer Assisted Tomography)
Source: Journal of Computer Assisted Tomography - November 1, 2014 Category: Radiology Tags: Abdominal Imaging Source Type: research

Isolated Pelvic Fluid in Males on Outpatient Magnetic Resonance Imaging Examinations: Differences in Incidence Based on Age
PurposeDetermine the incidence and amount of isolated pelvic fluid in males, stratified by age, on outpatient pelvic magnetic resonance imaging (MRI) examinations performed for lower back or extremity pain. MethodsAfter institutional review board approval, 161 pelvic MRIs performed on males for musculoskeletal or neurologic indications over an 18-month period were retrospectively reviewed for isolated pelvic fluid by 2 radiologists. Patients with a potential etiology for the fluid were excluded. Volume and maximal 2-dimensional measurements of fluid were calculated. Statistical analysis included logistic regression, Wilcox...
Source: Journal of Computer Assisted Tomography - November 1, 2014 Category: Radiology Tags: Abdominal Imaging Source Type: research

Comparison of Iterative Model–Based Reconstruction Versus Conventional Filtered Back Projection and Hybrid Iterative Reconstruction Techniques: Lesion Conspicuity and Influence of Body Size in Anthropomorphic Liver Phantoms
This study aimed to determine whether an iterative model–based reconstruction (IMR) can improve lesion conspicuity and depiction on computed tomography (CT) compared with filtered back projection (FBP) and hybrid iterative reconstruction (iDose4) using anthropomorphic phantoms. Materials and MethodsOne small and one large anthropomorphic body phantoms, each containing 8 simulated focal liver lesions (FLLs), were scanned using a 256-channel CT scanner at 120 kVp with variable tube current-time products (10-200 mAs). Scans were divided into 3 groups based on radiation dose (RD) as follows: (a) full dose (FD), (b) low d...
Source: Journal of Computer Assisted Tomography - November 1, 2014 Category: Radiology Tags: Abdominal Imaging Source Type: research

Choosing the Best Reconstruction Technique in Abdominal Computed Tomography: A Systematic Approach
ConclusionsThis study indicates that the preferred choice for reconstruction of CT liver examinations performed with the Toshiba Aquilion ONE should be the FC18 filter with IR, although the IR technique did not significantly improve lesion detectability and did not compensate for the dose reduction in this study. (Source: Journal of Computer Assisted Tomography)
Source: Journal of Computer Assisted Tomography - November 1, 2014 Category: Radiology Tags: Abdominal Imaging Source Type: research

Quantification of the Fat Fraction in the Liver Using Dual-Energy Computed Tomography and Multimaterial Decomposition
The objective of this study was to evaluate the feasibility and accuracy of postcontrast, dual-energy computed tomography (DECT) using multimaterial decomposition (MMD) for quantification of the hepatic fat fraction (HFF). MethodsVarious degrees of fatty liver were produced in 16 rabbits divided into 4 groups, by feeding them a high-fat, high-cholesterol diet. After 6 weeks, precontrast, single-energy computed tomography (SECT) and postcontrast DECT were performed, and HFF maps were obtained from the DECT using MMD. T2*-corrected, multiecho, chemical-shift imaging for obtaining the proton density fat fraction (PDFF) map an...
Source: Journal of Computer Assisted Tomography - November 1, 2014 Category: Radiology Tags: Abdominal Imaging Source Type: research

Magnetic Resonance Imaging Repercussions of Intravenous Iron Products Used for Iron-Deficiency Anemia and Dialysis-Associated Anemia
AbstractDuring the past 2 decades, routine use of recombinant erythropoiesis-stimulating agents (ESAs) has enabled anemia to be corrected in dialysis patients, thereby improving their quality of life and permitting better outcomes. As successful use of ESA requires sufficient available iron, almost all end-stage renal disease patients on ESA now receive concomitant parenteral iron therapy. Radiologists must be aware that iron overload among dialysis patients is now an increasingly recognized clinical situation in the ESA era yet was previously considered rare. The KDIGO Controversies Conference on Iron Management in Chroni...
Source: Journal of Computer Assisted Tomography - November 1, 2014 Category: Radiology Tags: Abdominal Imaging Source Type: research

Oncological Applications of Dual-Energy Computed Tomography Imaging
AbstractDual-energy computed tomography (DECT) imaging is a promising method used in oncology for accurate detection/diagnosis of malignant and benign lesions. Use of dual-energy spectral, weighted average, color-coded map, and virtual unenhanced images provides increased visual detection and easy lesion delineation. Lesion detectability, sensitivity, and conspicuity are significantly improved using DECT. Material characterization and decomposition are promising using DECT. Both anatomical and functional information related to oncology can be provided by DECT using single contrast-enhanced CT. (Source: Journal of Computer Assisted Tomography)
Source: Journal of Computer Assisted Tomography - November 1, 2014 Category: Radiology Tags: Abdominal Imaging Source Type: research

Reduction of Metal Artifacts From Alloy Hip Prostheses in Computer Tomography
The objective of this study was to evaluate the feasibility of reducing artifacts from large metal implants with gemstone spectral imaging (GSI) and metal artifact reduction software (MARS). MethodsTwenty-three in-vivo cobalt-chromium-molybdenum alloy total hip prostheses were prospectively scanned by fast kV-switching GSI between 80 and 140 kVp. The computed tomography images were reconstructed with monochromatic energy and with/without MARS. Both subjective and objective measurements were performed to assess the severity of metal artifacts. ResultsIncreasing photon energy was associated with reduced metal artifacts in GSI images (P
Source: Journal of Computer Assisted Tomography - November 1, 2014 Category: Radiology Tags: CT Physics and Technology Source Type: research

Measurement of Electron Density and Effective Atomic Number by Dual-Energy Scan Using a 320-Detector Computed Tomography Scanner with Raw Data-Based Analysis: A Phantom Study
AbstractWe evaluated the accuracy of the electron densities and effective atomic numbers determined by raw data-based dual-energy analysis on a 320-detector computed tomography scanner. The mean (SD) errors between the measured and true electron densities and between the measured and true effective atomic numbers were 1.3% (1.5%) and 3.1% (3.2%), respectively. Electron densities and effective atomic numbers can be determined with high accuracy, which may help to improve accuracy in radiotherapy treatment planning. (Source: Journal of Computer Assisted Tomography)
Source: Journal of Computer Assisted Tomography - November 1, 2014 Category: Radiology Tags: CT Physics and Technology Source Type: research

Computed Tomography Radiation Dose Reduction: Effect of Different Iterative Reconstruction Algorithms on Image Quality
ObjectiveWe evaluated the effects of hybrid and model-based iterative reconstruction (IR) algorithms from different vendors at multiple radiation dose levels on image quality of chest phantom scans. MethodsA chest phantom was scanned on state-of-the-art computed tomography scanners from 4 vendors at 4 dose levels (4.1 mGy, 3.0 mGy, 1.9 mGy, and 0.8 mGy). All data were reconstructed with filtered back projection (FBP) and reduced-dose data also with IR (iDose4, Adaptive Iterative Dose Reduction 3D, Adaptive Statistical Iterative Reconstruction, Sinogram-Affirmed Iterative Reconstruction, prototype Iterative Model Reconstruc...
Source: Journal of Computer Assisted Tomography - November 1, 2014 Category: Radiology Tags: CT Physics and Technology Source Type: research

Computed Tomography Radiation Dosimetry: From the Indicators to the Indications
AbstractThe technological advances in computed tomography (CT) scanners and their continuously increased use have raised concern about the patient-induced risks from the CT procedures. In the present review, all available dose metrics used in CT dosimetry are described, evaluated, and compared. The various models and methodologies currently existing for the estimation of the effective dose and, by extension, the carcinogenesis probability as well as the way that this is derived from dose descriptors are also considered. (Source: Journal of Computer Assisted Tomography)
Source: Journal of Computer Assisted Tomography - November 1, 2014 Category: Radiology Tags: CT Physics and Technology Source Type: research

Dual-Energy Computed Tomographic Virtual Noncalcium Algorithm for Detection of Bone Marrow Edema in Acute Fractures: Early Experiences
We report our initial experiences of 4 cases with imaging and clinical correlation. (Source: Journal of Computer Assisted Tomography)
Source: Journal of Computer Assisted Tomography - September 1, 2014 Category: Radiology Tags: Musculoskeletal Radiology Source Type: research

Computed Tomography (CT) Venography With Dual-Energy CT: Low Tube Voltage and Dose Reduction of Contrast Medium for Detection of Deep Vein Thrombosis
ConclusionsLow tube voltage enabled a reduction of contrast medium to 400 mgI/kg for CT venography. (Source: Journal of Computer Assisted Tomography)
Source: Journal of Computer Assisted Tomography - September 1, 2014 Category: Radiology Tags: Musculoskeletal Radiology Source Type: research

In Vivo Evaluation of Sciatic Nerve Crush Injury Using Diffusion Tensor Imaging: Correlation With Nerve Function and Histology
ObjectiveThe aim of this study was to prospectively estimate magnetic resonance diffusion tensor imaging parameters in distal portions of crushed sciatic nerves in rabbits and correlation with neurological function and histology. MethodsThirty-two rabbits were randomly divided into 8 groups and followed up at 10 weeks. The right sciatic nerves were crushed, and the left sciatic nerves served as the control group with sham operation. Another 4 rabbits were chosen in the normal control group. Diffusion tensor imaging scan was obtained on bilateral sciatic nerves using spin-echo single-shot echo planar imaging. The values of ...
Source: Journal of Computer Assisted Tomography - September 1, 2014 Category: Radiology Tags: Musculoskeletal Radiology Source Type: research

Optimizing Image Quality for Pediatric Torso Computed Tomography: The Use of Advanced Iterative Reconstruction and Wide-Detector Scanning Techniques
ConclusionsAdaptive iterative dose reduction 3D produces significant reduction in radiation dose without degradation to image quality compared with FBP. Significant dose reduction without loss of image quality can also be obtained in younger, smaller children using wide-detector technique. (Source: Journal of Computer Assisted Tomography)
Source: Journal of Computer Assisted Tomography - September 1, 2014 Category: Radiology Tags: Cardiothoracic Imaging Source Type: research

Impact of Endobronchial Coiling for Lung Volume Reduction on Pulmonary Volume and Attenuation: Preinterventional and Postinterventional Computed Tomography—Quantification Using Separate Lobe Measurements
ConclusionsOur results objectify volume reduction of the treated lobe coupled by a significant volume expansion of the ipsilateral lobe as a sole correlate for clinical improvement in responders. (Source: Journal of Computer Assisted Tomography)
Source: Journal of Computer Assisted Tomography - September 1, 2014 Category: Radiology Tags: Original Article Source Type: research

Quantitative Assessment of Atrial Regional Function Using Motion Estimation Computed Tomography
ObjectivesWe validated a novel image-based motion estimation computed tomographic (CT) technique (iME) to quantify atrial regional function in swine in vivo. Materials and MethodsDomestic swine (n = 8) underwent CT scan with intravenous contrast before and after median sternotomy where 15 to 30 glass beads were sutured to the atria to calculate the motion estimation error. Four-dimensional motion vector field was estimated using iME. Area change ratio (%AC) was calculated over the atrial endocardium to assess the surface deformation. ResultsThe error between the measured and the calculated coordinates based on motion vecto...
Source: Journal of Computer Assisted Tomography - September 1, 2014 Category: Radiology Tags: Cardiothoracic Imaging Source Type: research

Epicardial Fat and Coronary Artery Calcification in Patients on Long-Term Hemodialysis
IntroductionRecent studies have shown a significant correlation between increased epicardial fat volume (EFV) and mortality, coronary artery disease events, and measures of coronary atherosclerotic burden, for example, coronary calcium. Patients with chronic kidney disease on hemodialysis have an increased prevalence of coronary atherosclerosis and coronary calcium. The mechanisms underlying both may differ from patients with normal kidney function. Only limited data are available on the relationship between epicardial fat and coronary calcium in these patients. MethodsNinety-three consecutive patients (62 men and 31 women...
Source: Journal of Computer Assisted Tomography - September 1, 2014 Category: Radiology Tags: Cardiothoracic Imaging Source Type: research

Role of Compressive Sensing Technique in Dose Reduction for Chest Computed Tomography: A Prospective Blinded Clinical Study
ConclusionsMore than 90% dose reduction could be achieved with one-fourth sparse-sampled and SubmSv chest CT examination when reconstructed with IRT. Chest CT dose at one fourth of a millisievert with SpS is possible with optimal lesion detection and diagnostic confidence for the evaluation of pulmonary findings. (Source: Journal of Computer Assisted Tomography)
Source: Journal of Computer Assisted Tomography - September 1, 2014 Category: Radiology Tags: Cardiothoracic Imaging Source Type: research

Coronary Artery Calcification on Computed Tomography Correlates With Mortality in Chronic Obstructive Pulmonary Disease
ConclusionsCoronary artery calcification severity and emphysema severity on CT images are related and are strongly as well as independently associated with prognosis in patients with moderate to severe COPD. The potential to use CAC OVS on unenhanced nongated CT as a screening tool for coronary artery disease and as a prognostic marker in patients with COPD needs further investigation in prospective studies. (Source: Journal of Computer Assisted Tomography)
Source: Journal of Computer Assisted Tomography - September 1, 2014 Category: Radiology Tags: Cardiothoracic Imaging Source Type: research

Value of Tumor Vessel Sign in Isolated Circumscribed Hypervascular Abdominopelvic Mesenchymal Tumors on Multidetector Computed Tomography
ConclusionsThe presence of the sign is considered to be helpful for differentiating the 4 groups of tumors. (Source: Journal of Computer Assisted Tomography)
Source: Journal of Computer Assisted Tomography - September 1, 2014 Category: Radiology Tags: Abdominal Imaging Source Type: research

Feasibility of MDCT Angiography for Determination of Tumor-Feeding Vessels in Chemoembolization of Hepatocellular Carcinoma
ConclusionMultidetector CT angiography using MIP showed good imaging quality and high accuracy for determination of subsegmental tumor-feeding vessels. (Source: Journal of Computer Assisted Tomography)
Source: Journal of Computer Assisted Tomography - September 1, 2014 Category: Radiology Tags: Abdominal Imaging Source Type: research

Time-to-Peak Values Can Estimate Hepatic Functional Reserve in Patients Undergoing Surgical Resection: A Comparison Between Perfusion CT and Indocyanine Green Retention Test
ObjectiveTo evaluate the potential usefulness of perfusion computed tomography (CT) for the estimation of hepatic functional reserve in patients scheduled for surgical resection and to compare the results with those of the indocyanine green retention test results. MethodsThirty-one patients with hepatobiliary malignancies were included. Perfusion CT and indocyanine green retention test were performed on the same day, and their results were compared using Pearson correlation test. ResultsA strong correlation was found between perfusion CT time-to-peak values and indocyanine green retention rate at 15 minutes and indocyanine...
Source: Journal of Computer Assisted Tomography - September 1, 2014 Category: Radiology Tags: Abdominal Imaging Source Type: research

Preoperative Prediction Model for Conversion of Laparoscopic to Open Cholecystectomy in Patient With Acute Cholecystitis: Based on Clinical, Laboratory, and CT Parameters
ConclusionsPericholecystic fluid collection was the only CT parameter with clinical parameters of age older than 60 years and male in prediction for conversion in acute cholecystitis. The preoperative prediction model using these 3 parameters can be adapted easily in clinical practice with a good discrimination. (Source: Journal of Computer Assisted Tomography)
Source: Journal of Computer Assisted Tomography - September 1, 2014 Category: Radiology Tags: Abdominal Imaging Source Type: research

Stercoral Colitis: A Lethal Disease—Computed Tomographic Findings and Clinical Characteristic
ConclusionsComputed tomography is an important diagnostic modality for stercoral colitis. The presence of a large fecaloma with distention of the affected colon and wall thickening and pericolonic fat stranding should alert radiologists and surgeons to the presence of this potentially fatal condition. (Source: Journal of Computer Assisted Tomography)
Source: Journal of Computer Assisted Tomography - September 1, 2014 Category: Radiology Tags: Abdominal Imaging Source Type: research

Reduction of Iodine Load in CT Imaging of Pancreas Acquired With Low Tube Voltage and an Adaptive Statistical Iterative Reconstruction Technique
PurposeTo prospectively assess the contrast enhancement, image quality, radiation dose, and detectability of malignant pancreatic tumors with pancreatic computed tomography (CT) obtained at an 80-kilovolt (peak) (kV[p]) tube voltage setting and reduced iodine dose. MethodsInstitutional review board approval and written informed consent were obtained. During a recent 10-month period, 136 patients (66 men and 70 women; age range, 21–86 years; mean ± SD age, 65.9 ± 11.0 years) with suspected pancreatic disease were randomized into 3 groups according to the following iodine-load and tube-voltage protocols: ...
Source: Journal of Computer Assisted Tomography - September 1, 2014 Category: Radiology Tags: Abdominal Imaging Source Type: research

Image Quality Improvement in Submillisievert Computed Tomographic Colonography Using a Fast 3-dimensional Noise Reduction Method
The objective of this study was to evaluate the image quality in submillisievert computed tomographic colonography (CTC) images using a structure preserving diffusion denoising method. MethodsImage quality was compared before and after denoising in 31 patients. One hundred twenty–kilovolt, 30-mAs prone CTC scans were used as reference and compared with submillisievert 140-kV, 10-mAs supine scans. Two readers assessed 2-dimensional and endoluminal image quality. The image noise and the signal-to-noise ratio were measured. ResultsAfter denoising, image quality scores improved in both supine series and prone series (P
Source: Journal of Computer Assisted Tomography - September 1, 2014 Category: Radiology Tags: Abdominal Imaging Source Type: research

Unenhanced Respiratory-Gated Magnetic Resonance Angiography (MRA) of Renal Artery in Hypertensive Patients Using True Fast Imaging With Steady-State Precession Technique Compared With Contrast-Enhanced MRA
This study was aimed to evaluate the accuracy of “True Fast Imaging with Steady-State Precession” (TrueFISP) MR angiography (MRA) for diagnosis of renal arterial stenosis (RAS) in hypertensive patients. MethodsTwenty-two patients underwent both TrueFISP MRA and contrast-enhanced MRA (CE-MRA) on a 1.5-T MR imager. Volume of main renal arteries, length of maximal visible renal arteries, number of visualized branches, stenotic grade, and subjective quality were compared. Paired 2-tailed Student t test and Wilcoxon signed rank test were applied to evaluate the significance of these variables. ResultsVolume of main ...
Source: Journal of Computer Assisted Tomography - September 1, 2014 Category: Radiology Tags: Abdominal Imaging Source Type: research

Can Sinogram-Affirmed Iterative Reconstruction Improve the Detection of Small Hypervascular Liver Nodules With Dual-Energy CT?
ConclusionsIterative reconstructions increase the sensitivity for detecting abdominal lesions, even in the 80-kVp series. The kernel I30-S5 was considered the best. (Source: Journal of Computer Assisted Tomography)
Source: Journal of Computer Assisted Tomography - September 1, 2014 Category: Radiology Tags: Abdominal Imaging Source Type: research

Imaging Features and Metastatic Pattern of Non–IVC Retroperitoneal Leiomyosarcomas: Are They Different From IVC Leiomyosarcomas?
PurposeThe purposes of this study were to describe the imaging features and metastatic pattern of non–inferior vena cava (IVC) retroperitoneal leiomyosarcomas (non–IVC LMS) and to compare them with those of IVC leiomyosarcomas (IVC LMS) to assess any differences between the 2 groups. Materials and MethodsIn this institutional review board–approved, Health Insurance Portability and Accountability Act–compliant retrospective study, all 56 patients with pathologically confirmed primary retroperitoneal leiomyosarcoma (34 non–IVC LMS and 22 IVC LMS) seen at our tertiary cancer center during a 10-ye...
Source: Journal of Computer Assisted Tomography - September 1, 2014 Category: Radiology Tags: Abdominal Imaging Source Type: research

Assessment of Dynamic Contrast-Enhanced Magnetic Resonance Imaging in the Differentiation of Pancreatic Ductal Adenocarcinoma From Other Pancreatic Solid Lesions
ConclusionsThe parameters of QDCE-MRI are useful for the diagnosis of PDA. (Source: Journal of Computer Assisted Tomography)
Source: Journal of Computer Assisted Tomography - September 1, 2014 Category: Radiology Tags: Abdominal Imaging Source Type: research