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Optimising the use of iodinated contrast agents in CT scans: Vascular, visceral, multiphasic and split-bolus examinations.
Radiologia (Engl Ed)
October 2024
Servicio de Radiodiagnóstico, Hospital Universitario Central de Asturias, Oviedo, Spain.
Iodinated contrast is administered when carrying out computed tomography (CT) scans to define anatomical structures and detect pathologies. The contrast is administered according to different protocols which vary significantly and include vascular, visceral, multiphasic and split-bolus injection studies. Each protocol has its own indications and particularities to optimise the use of the contrast medium in each situation.
View Article and Find Full Text PDFDesign and Use of a Custom Phantom for Regular Tests of Radiography Apparatus: A Feasibility Study.
J Imaging
October 2024
Department of Medical Equipment, Electronic and Information Technologies in Healthcare, Medical University of Varna, 9002 Varna, Bulgaria.
This study investigates the feasibility of employing an in-house-developed physical phantom dedicated to the weekly quality control testing of radiographic systems, performed by radiographers. For this purpose, a 3D phantom was fabricated, featuring test objects, including a model representing a lesion. Alongside this phantom, a commercial phantom, specifically, IBA's Primus L, was utilized.
View Article and Find Full Text PDFAddressing challenges in diagnostic X-ray dosimetry: uncertainties and corrections for AlO:C-based optically stimulated luminescent dosimeters.
Phys Eng Sci Med
September 2024
Medical Physics Laboratory, Radiation Safety and Health Division, Malaysian Nuclear Agency, 43000, Bangi, Kajang, Selangor, Malaysia.
The use of AlO:C-based optically stimulated luminescent dosimeters (OSLDs) in diagnostic X-ray is a challenge because of their energy dependence (ED) and variability of element sensitivity factors (ESFs). This study aims to develop a method to determine ED and ESFs of Landauer nanoDot™ OSLDs for clinical X-ray and investigate the uncertainties associated with ESF and ED correction factors. An area of 2 × 2 cm at the central axis of the X-ray field was used to establish the ESFs.
View Article and Find Full Text PDFDual-energy computed tomography imaging with megavoltage and kilovoltage X-ray spectra.
J Med Imaging (Bellingham)
March 2024
University of Chicago, Department of Radiology, Chicago, Illinois, United States.
Purpose: Single-energy computed tomography (CT) often suffers from poor contrast yet remains critical for effective radiotherapy treatment. Modern therapy systems are often equipped with both megavoltage (MV) and kilovoltage (kV) X-ray sources and thus already possess hardware for dual-energy (DE) CT. There is unexplored potential for enhanced image contrast using MV-kV DE-CT in radiotherapy contexts.
View Article and Find Full Text PDFComparison of visual and semi-automated kilovoltage cone beam CT image QA analysis.
J Appl Clin Med Phys
February 2024
Department of Radiation Oncology, University of Minnesota, Minneapolis, Minnesota, USA.
Established kilovoltage cone-beam computed tomography (kV-CBCT) image quality assurance (QA) guidelines often rely on recommendations provided by the American Association of Physicists in Medicine (AAPM) task group (TG) reports with metrics that use visual analysis. This can result in measurement variations by different users, especially in visually subjective analyzes such as low contrast resolution. Consequently, there is a growing interest in more automated means of image QA analysis that can offer increased consistency, accuracy, and convenience.
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