Objective: The aim of this study was to investigate the image quality, radiation dose, and accuracy of virtual noncontrast images and iodine quantification of split-filter dual-energy computed tomography (CT) using a single x-ray source in a phantom and patient study.
Materials And Methods: In a phantom study, objective image quality and accuracy of iodine quantification were evaluated for the split-filter dual-energy mode using a tin and gold filter. In a patient study, objective image quality and radiation dose were compared in thoracoabdominal CT of 50 patients between the standard single-energy and split-filter dual-energy mode. The radiation dose was estimated by size-specific dose estimate. To evaluate the accuracy of virtual noncontrast imaging, attenuation measurements in the liver, spleen, and muscle were compared between a true noncontrast premonitoring scan and the virtual noncontrast images of the dual-energy scans. Descriptive statistics and the Mann-Whitney U test were used.
Results: In the phantom study, differences between the real and measured iodine concentration ranged from 2.2% to 21.4%. In the patient study, the single-energy and dual-energy protocols resulted in similar image noise (7.4 vs 7.1 HU, respectively; P = 0.43) and parenchymal contrast-to-noise ratio (CNR) values for the liver (29.2 vs 28.5, respectively; P = 0.88). However, the vascular CNR value for the single-energy protocol was significantly higher than for the dual-energy protocol (10.0 vs 7.1, respectively; P = 0.006). The difference in the measured attenuation between the true and the virtual noncontrast images ranged from 3.1 to 6.7 HU. The size-specific dose estimate of the dual-energy protocol was, on average, 17% lower than that of the single-energy protocol (11.7 vs 9.7 mGy, respectively; P = 0.008).
Conclusions: Split-filter dual-energy compared with single-energy CT results in similar objective image noise in addition to dual-energy capabilities at 17% lower radiation dose. Because of beam hardening, split-filter dual-energy can lead to decreased CNR values of iodinated structures.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1097/RLI.0000000000000257 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Biodistribution and Dosimetry Evaluation of the Radiolabeled Somatostatin Receptor Antagonist 68Ga-DATA5m LM4 in Molecular Imaging of Well-Differentiated Gastroenteropancreatic Neuroendocrine Tumors Patients.
Clin Nucl Med
January 2025
From the Department of Nuclear Medicine, All India Institute of Medical Sciences, New Delhi, India.
Purpose: This study aimed to assess the biodistribution and radiation dosimetry of 68Ga-DATA5m LM4 in patients with gastroenteropancreatic neuroendocrine tumors.
Patients And Methods: Eight patients (5 females and 3 males) with various gastroenteropancreatic neuroendocrine tumors were included in the study. Each patient underwent 3 whole-body PET scans at 10, 60, and 120 minutes after receiving an IV injection of approximately 162.
Radiation exposure in patients with inflammatory bowel disease.
J Crohns Colitis
January 2025
Translational Research in Gastrointestinal Disorders (TARGID), Department of Chronic Diseases and Metabolism, KU Leuven, Leuven, Belgium and Department of Gastroenterology and Hepatology, University Hospitals Leuven, Belgium.
Background And Aims: Radiological imaging is crucial for diagnosing and monitoring patients with inflammatory bowel diseases (IBD). With increasing awareness of radiation risks, imaging doses should be 'as low as reasonably achievable', with a risk level that one should try to stay underneath 75 mSv. However, real-world data on cumulative exposure are limited.
View Article and Find Full Text PDFEvaluation of Gamma Index Analysis for Detecting Errors in Patient-specific Quality Assurance in Intensity Modulated Radiotherapy.
Health Phys
January 2025
Department of Radiation Oncology, Medicine Faculty of Van Yüzüncü Yıl University, Van, Turkey.
Quality assurance practices performed before treatment are believed to identify various potential errors. In this study, 2-dimensional (2D) dosimetric results were analyzed by making some intentional mistakes in six different treatment plans. In this way, the detectability of errors was investigated.
View Article and Find Full Text PDFThe unraveling of a Nobel Prize: How Hermann Muller was awarded the Nobel Prize: A front for eugenics.
J Occup Environ Hyg
January 2025
Finance Department, University of Texas at Austin, Austin, Texas.
This paper asserts that the Nobel Prize for Medicine/Physiology that Hermann J. Muller received in 1946 was a front to enhance the legitimacy, acceptance, and application of eugenics, a strategy to guide the direction and rate of human evolutionary change. Seven of the nine people nominating (1932-1946) Muller were proponents of eugenics with Muller being among the most visible of the scientific leaders.
View Article and Find Full Text PDFInfluence of Obesity, Race and Gender on Radiation Exposure for Epidural Procedures.
Curr Pain Headache Rep
January 2025
Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA.
Purpose Of Review: This retrospective, case controlled, comparative evaluation review of radiation exposure during epidural procedures in interventional pain management assessed variations in radiation exposure based on obesity, race, and gender.
Recent Findings: Numerous publications have shown increasing radiation exposure based on body mass index (BMI). However, the influence of race and gender have not been studied.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!