CT Dosimetry: What Has Been Achieved and What Remains to Be Done

Radiation dose in computed tomography (CT) has become a hot topic due to an upward trend in the number of CT procedures worldwide and the relatively high doses associated with these procedures. The main aim of this review article is to provide an overview of the most frequently used metrics for CT radiation dose characterization, discuss their strengths and limitations, and present patient dose assessment methods. Computed tomography dosimetry is still based on a CT dose index (CTDI) measured using 100-mm-long pencil ionization chambers and standard dosimetry phantoms (CTDI100). This dose index is easily measured but has important limitations. Computed tomography dose index underestimates the dose generated by modern CT scanners with wide beam collimation. Manufacturers should report corrected CTDI values in the consoles of CT systems. The size-specific dose estimate has been proposed to provide an estimate of the average dose at the center of the scan volume along the z-axis of a CT scan. Size-specific dose estimate is based on CTDI and conversion factors and, therefore, its calculation incorporates uncertainties associated with the measurement of CTDI. Moreover, the calculation of size-specific dose estimate is straightforward only when the tube current modulation is not activated and when the patient body diameter does not change considerably along the z-axis of the scan. Effective dose can be used to provide typical patient dose values from CT examinations, compare dose b...
Source: Investigative Radiology - Category: Radiology Tags: Review Articles Source Type: research

Related Links:

Women with high-risk breast tumors had more than double the chance of distant...Read more on AuntMinnie.comRelated Reading: 2 breast lesion traits that signal future cancer risk CT scans can predict CVD risk in breast cancer patients Image-guided biopsy spots residual breast cancer Radiologists, AI make a great team in screening mammo Interval breast cancers have unique characteristics
Source: AuntMinnie.com Headlines - Category: Radiology Source Type: news
Rationale: Prostate-specific membrane antigen positron emission tomography-computed tomography (18F-PSMA-1007 PET/CT) imaging is an emerging method for the diagnosis of prostate cancer (PC), but its efficiency in detecting other accompanying diseases has rarely been investigated. Patient concerns: A 77-year-old man presented with a complaint of bone pain throughout his entire body lasting for 2 weeks. Routine preoperative whole-body bone scanning revealed multiple osteogenic metastases. His alpha-fetoprotein and prostate-specific antigen levels were 108.2 ng/mL and 53.32 ng/mL, respectively. 18F-PSMA-1007 PET/...
Source: Medicine - Category: Internal Medicine Tags: Research Article: Clinical Case Report Source Type: research
In this study, we show that18F-DCFPyl might detect neovasculature in advanced, metastatic differentiated thyroid cancer (DTC). We first stained the preserved lymph node samples of three patients with DTC who had undergone total thyroidectomy and neck dissection for cervical lymph node metastatic disease to identify PSMA expression, with the PSMA antibody (DAKO Monoclonal). Then, we performed18F-DCFPyl imaging in two other advanced DTC patients with elevated serum thyroglobulin (Tg), indicative of residual disease. We compared the findings with contemporaneous FDG PET/CT scan, conventional Imaging (CT,MRI) and whole-body sc...
Source: Medical Oncology - Category: Cancer & Oncology Source Type: research
This article provides a structured literature review of the most important studies investigating the role of PET or PET/CT in the clinical practice of MCC.
Source: Cancers - Category: Cancer & Oncology Authors: Tags: Review Source Type: research
ConclusionsThis study demonstrated the feasibility of total laparoscopic pancreaticoduodenectomy combined with vascular resection and artificial vascular graft reconstruction in properly selected cases of pancreatic cancer with vein involvement after neoadjuvant chemotherapy. It is worth noting that skilled laparoscopic technicians and effective teamwork are necessities for safe completion of the procedure.
Source: Journal of Gastrointestinal Surgery - Category: Surgery Source Type: research
Image-guided biopsies performed after breast cancer patients have been treated...Read more on AuntMinnie.comRelated Reading: CT scans can predict CVD risk in breast cancer patients Breast screening helps precision medicine succeed Radiation tied to breast cancer delays for Black women Women with DCIS have 3x the risk of breast cancer death Delayed breast cancer surgery not tied to worse outcomes
Source: AuntMinnie.com Headlines - Category: Radiology Source Type: news
We report a case of a patients affected by breast cancer who underwent PET/CT after therapy; a focal 18F-FDG uptake of not univocal interpretation was observed between liver and pleura. A subsequent acquisition on the right lateral decubitus showed the pleural location of lesion, thus improving the diagnostic accuracy of the PET/CT finding. PMID: 33020233 [PubMed - as supplied by publisher]
Source: Journal of Nuclear Medicine Technology - Category: Nuclear Medicine Tags: J Nucl Med Technol Source Type: research
Not all benign findings on screening mammography are equal. A Spanish team...Read more on AuntMinnie.comRelated Reading: CT scans can predict CVD risk in breast cancer patients Language can be barrier to breast screening Breast screening helps precision medicine succeed Notification laws may not lead to more breast screening Language matters when screening women with dense breasts
Source: AuntMinnie.com Headlines - Category: Radiology Source Type: news
ConclusionThe radiomics nomogram showed potential for individualized differential diagnosis between solid active pulmonary TB and solid LC, although the improvement of performance was not significant relative to semantic model.
Source: Molecular Imaging and Biology - Category: Molecular Biology Source Type: research
Clinicians used CT scans of coronary artery calcium to predict which patients...Read more on AuntMinnie.comRelated Reading: Radiation tied to breast cancer delays for Black women Women with DCIS have 3x the risk of breast cancer death Single radiotherapy dose effective for breast cancer Radiologists, AI make a great team in screening mammo AI software can cut screening mammography workload
Source: AuntMinnie.com Headlines - Category: Radiology Source Type: news
More News: Cancer | Cancer & Oncology | CT Scan | PET Scan | Radiology