Experimental verification of stopping-power prediction from single- and dual-energy computed tomography in biological tissues.

Experimental verification of stopping-power prediction from single- and dual-energy computed tomography in biological tissues. Phys Med Biol. 2017 Dec 14;: Authors: Möhler C, Russ T, Wohlfahrt P, Elter A, Runz A, Richter C, Greilich S Abstract An experimental setup for consecutive measurement of ion and x-ray absorption in tissue or other materials is introduced. With this setup using a 3D-printed sample container, the reference stopping-power ratio (SPR) of materials can be measured with an uncertainty of below 0.1%. A total of 65 porcine and bovine tissue samples were prepared for measurement, comprising five samples each of 13 tissue types representing about 80% of the total body mass (three different muscle and fatty tissues, liver, kidney, brain, heart, blood, lung and bone). Using a standard stoichiometric calibration for single-energy CT (SECT) as well as a state-of-the-art dual-energy CT (DECT) approach, SPR was predicted for all tissues and then compared to the measured reference. With the SECT approach, the SPRs of all tissues were predicted with a mean error of (-0.84 ± 0.12)% and a mean absolute error of (1.27 ± 0.12)%. In contrast, the DECT-based SPR predictions were overall consistent with the measured reference with a mean error of (-0.02 ± 0.15)% and a mean absolute error of (0.10 ± 0.15)%. Thus, in this study, the potential of DECT to decrease range uncertainty could be confirmed in biological tissue. ...
Source: Physics in Medicine and Biology - Category: Physics Authors: Tags: Phys Med Biol Source Type: research

Related Links:

CONCLUSION: Most CPAFs identified on CCTA have a favorable prognosis. Observation with OMT is usually an appropriate strategy. Fistula size is a possible determinant for surgical treatment. PMID: 31606954 [PubMed - in process]
Source: Korean Journal of Radiology - Category: Radiology Tags: Korean J Radiol Source Type: research
Publication date: Available online 13 October 2019Source: Journal of Vascular Surgery: Venous and Lymphatic DisordersAuthor(s): Katherine L. Morrow, James Bena, Sean P. Lyden, Ezequiel Parodi, Christopher J. SmolockAbstractObjectiveInferior vena cava (IVC) filters have been commonly used to prevent pulmonary embolism in patients with deep vein thrombosis. However, IVC filters have been associated with risks, including IVC perforation, filter migration, fracture, and thrombosis. Filter retrieval has not always been successful. Our objective was to identify the factors associated with failure of retrieval of IVC filters.Meth...
Source: Journal of Vascular Surgery: Venous and Lymphatic Disorders - Category: Surgery Source Type: research
AbstractIt is unknown whether treatment in very early/early systemic sclerosis (SSc) can affect long-term outcomes. A case-based review was conducted (i) to assess the effect of rituximab (RTX) in very early SSc and (ii) to explore how many clinical trials in SSc targeted early disease and whether treatment of these patients led to better clinical outcomes. We identified cases of very early SSc from our department and performed a search in MEDLINE and Scopus databases for clinical trials in SSc during 2005 –2018. Two cases are reported where RTX was administered within 24 months from the appearance of Raynaud&rs...
Source: Rheumatology International - Category: Rheumatology Source Type: research
ConclusionIt is difficult to distinguish amputation neuroma from malignant tumors because radiological findings of a neuroma mimic findings of malignancy. Intraoperative diagnosis is necessary to select an appropriate surgical procedure due to the difficulty of preoperative diagnosis.
Source: International Journal of Surgery Case Reports - Category: Surgery Source Type: research
ConclusionsPhysicians should be alert of this tumor despite its rarity because diagnostic delays increase mortality. In this report, we summarize the features that differentiate PPAS from PE and the importance of imaging in diagnosing the tumor.
Source: International Journal of Surgery Case Reports - Category: Surgery Source Type: research
Publication date: Available online 12 October 2019Source: Oral Surgery, Oral Medicine, Oral Pathology and Oral RadiologyAuthor(s): Şehrazat Evirgen, Halil Tolga Yüksel, Gökçe Yüksel, Barış Kaki, Kıvanç KamburoğluAbstractObjectiveTo identify the prevalence and radiological characteristics of intravertebral pneumatocysts (IVP), degenerative joint disease (DJD), and ponticulus posticus (PP) in the cervical spine using CBCT images. The correlations between the presence of these lesions, and the correlations of the lesions to patient age and sex, were also evaluated.Study DesignCBCT images obta...
Source: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology - Category: ENT & OMF Source Type: research
Aortoenteric fistula (AEF) is a rare cause of gastrointestinal (GI) bleeding. If not promptly diagnosed and treated the associated mortality is very high. The role of endovascular treatment is not yet defined. In this paper we report a clinical case of a 94-year-old male admitted in the emergency department with rectal bleeding. Due to detection of a pulsatile abdominal mass, a computed tomography angiography (CTA) scan was performed, which established the diagnosis of aorto-enteric fistula due to a left common iliac artery aneurysm (CIAA) ruptured to the sigmoid colon and also revealed an abdominal aortic aneurysm (AAA) a...
Source: Annals of Vascular Surgery - Category: Surgery Authors: Tags: Case Report Source Type: research
We present a case of a 70-year-old woman with acute presentation of bilateral limb ischemia and abdominal pain. Angio-CT scan showed the sub-occlusion of the distal thoracic aorta due to a severe calcified coarctaction with intraluminal thrombosis, a chronic occlusion of the superior mesenteric and celiac trunk arteries, an hypertrophic inferior mesenteric artery associated with signs of partial left kidney ischemia.
Source: Annals of Vascular Surgery - Category: Surgery Authors: Tags: Case Report Source Type: research
Acute superior mesenteric artery thrombosis is usually fatal; however, early intravascular treatment using a mechanical thrombectomy device can be an effective intervention. A 70-year-old man with atrial fibrillation presented with sudden abdominal pain; superior mesenteric artery thrombosis was confirmed using contrast-enhanced computed tomography. Thrombolysis, mechanical fragmentation, aspiration, and thrombectomy were successfully performed using the Trevo ® XP ProVue stent retriever via a brachial approach, and intestinal necrosis was avoided.
Source: Annals of Vascular Surgery - Category: Surgery Authors: Tags: Case Report Source Type: research
ConclusionsThe femoral tunnel positions created by the TT technique were significantly higher, with larger variance, than the TP technique in double-bundle ACL reconstruction, although the positions seemed to be within anatomical footprint. In addition, there were several cases in which femoral tunnels could not be created at the intended position by the TT technique.Level of evidenceI
Source: Knee Surgery, Sports Traumatology, Arthroscopy - Category: Orthopaedics Source Type: research
More News: Biology | Brain | Cardiology | CT Scan | Heart | Liver | Neurology | Physics | Study | Urology & Nephrology