To compare the radiation dose and image quality of retrospective electrocardiogram (ECG)-gated cardiac computed tomography (CT) between a 100-kVp protocol, hybrid iterative reconstruction (HIR), and display preset optimization and the 120-kVp protocol.We prospectively enrolled 100 patients with tachycardia or atrial fibrillation scanned retrospective ECG-gated cardiac CT. We randomly assigned 50 patients to the 120-kVp protocol and 50 patients to the 100-kVp protocol. We compared effective doses (EDs) between the two protocols. The 120-kVp images were post-processed using filtered back projection (FBP). The 100-kVp images were post-processed using FBP (100-kVp protocol) and HIR (i-100-kVp protocol). We compared attenuation of the ascending aorta, signal-to-noise ratio (SNR), and image noise between the 120-kVp, 100-kVp, and i-100-kVp protocols. We performed qualitative image analysis for the 120-kVp and i-100-kVp protocols.ED of the 100-kVp protocol (4.4 ± 0.4 mSv) was 76% lower than that of the 120-kVp protocol (18.4 ± 0.6 mSv). Attenuations of the 100-kVp (549.1 ± 73.8 HU) and i-100-kVp (550.5 ± 73.7 HU) protocols were higher than that of the120-kVp protocol (437.3 ± 55.7 HU). Image noise of the 100-kVp (53.6 ± 18.5 HU) and i-100-kVp (30.9 ± 8.6 HU) protocols were higher than that of the120-kVp protocol (23.8 ± 5.7 HU). There was no significant difference in SNR and the result of qualitative image analysis between the 120-kVp and i-100-kVp protocols.The 100-kVp protocol with HIR reduced the 76% radiation dose while preserving the image quality compared with the conventional 120-kVp protocol on retrospective ECG-gated cardiac CT.
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http://dx.doi.org/10.1097/MD.0000000000005459 | DOI Listing |
Bioengineering (Basel)
December 2024
Department of Radiology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.
This study aimed to optimize CT esophagography by identifying effective oral contrast dilution ratios and exploring the advantages of dual-energy CT (DECT) over conventional CT for improving image quality. Ex vivo experiments using iodine contrast agents (320-400 mgI/mL) at 21 dilution ratios were scanned at three voltages, with additional dual-energy scans generating various reconstruction images. Image quality was assessed both objectively and subjectively.
View Article and Find Full Text PDFActa Cardiol
December 2024
Department of Cardiovascular Radiology & Endovascular Interventions, All India Institute of Medical Sciences, New Delhi, India.
Objective: The present study sought to compare the reliability and radiation dose of coronary artery calcium (CAC) scoring using low tube current (16 mAs), low kilo-voltage peak (100 kVp) and advanced modelled iterative reconstruction (ADMIRE 5) with the standard protocol (80 mAs, 120 kVp, ADMIRE 3).
Material And Methods: A prospective single centre study including 200 consecutive patients with suspected coronary artery disease referred for CT coronary angiography was conducted. All 200 patients underwent CAC scoring using the low current-low kVp protocol as well as standard protocol and were subdivided into a derivation and validation cohorts.
Br J Radiol
December 2024
Department of Radiology, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, 710061, China.
Eur Radiol
September 2024
Department of Medical Surgical Sciences and Translational Medicine, Sapienza University of Rome, Rome, Italy.
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