Assessment of radiation dose and iodine load reduction in head-neck CT angiography using two scan protocols with wide-detector

2019 ◽  
Vol 27 (5) ◽  
pp. 981-993
Author(s):  
Yongxia Zhao ◽  
Xue Geng ◽  
Tianle Zhang ◽  
Xiuzhi Wang ◽  
Yize Xue ◽  
...  
Keyword(s):  
Radiation Dose ◽  
Ct Angiography ◽  
Load Reduction ◽  
Head Neck

Radiation Dose at Coronary CT Angiography: Second-Generation Dual-Source CT Versus Single-Source 64-MDCT and First-Generation Dual-Source CT

2011 ◽  
Vol 196 (5) ◽  
pp. W550-W557 ◽  
Author(s):  
Christian Fink ◽  
Radko Krissak ◽  
Thomas Henzler ◽  
Ursula Lechel ◽  
Gunnar Brix ◽  
...  
Keyword(s):  
Radiation Dose ◽  
Ct Angiography ◽  
Coronary Ct Angiography ◽  
First Generation ◽  
Second Generation ◽  
Dual Source Ct ◽  
Single Source ◽  
Coronary Ct ◽  
Dual Source

Diagnostic performance and radiation dose of lower extremity CT angiography using a 128-slice dual source CT at 80 kVp and high pitch

2015 ◽  
Vol 57 (7) ◽  
pp. 822-828 ◽  
Author(s):  
Jin Woo Kim ◽  
Ki Seok Choo ◽  
Ung Bae Jeon ◽  
Tae Un Kim ◽  
Jae Yeon Hwang ◽  
...  
Keyword(s):  
Radiation Dose ◽  
Lower Extremity ◽  
Ct Angiography ◽  
Diagnostic Performance ◽  
Dual Source Ct ◽  
High Pitch ◽  
Dual Source

scholarly journals Evaluation of Low-kVp Low-Volume Iodinated Contrast Protocol for Coronary CT Angiography Using Retrospective ECG Gating

2022 ◽  
Author(s):  
Atul Kapoor ◽  
Goldaa Mahajan ◽  
Aprajita Kapoor
Keyword(s):  
Radiation Dose ◽  
Ct Angiography ◽  
Ecg Gating ◽  
Heart Rates ◽  
Iodinated Contrast ◽  
Significant Difference ◽  
Group A ◽  
Low Volume ◽  
Group B ◽  
Low Kvp

Abstract Objective The aim of this study was to evaluate the use of low peak kilovoltage (kVp) low-volume iodinated contrast protocol for performing coronary computed tomography (CT) angiography (CCTA) in patients using retrospective electrocardiogram (ECG) gating. Materials and Methods Hundred prospective patients undergoing CCTA were studied in two groups, A and B, using 70 kilovoltage (kV) and 120 kV protocols with half and standard intravenous volumes of injected iodinated contrast, respectively. All patients had heart rates less than 100 beats/min and body mass index (BMI) less than 31 kg/m2. Both the groups were evaluated for signal-to-noise (S/N) and contrast-to-noise (C/N) ratios along with radiation dose delivered in millisievert (mSv), and for image quality (IQ), on per patient and per segment basis. Results Patients with group A showed statistically reduced radiation dose of 1.86 mSv compared with 6.86 mSv in group B patients. Marked reduction in image noise with statistically improved S/N and C/N ratios in all coronary vessels was seen in group A. S/N ratios in group A were 20.25, 18.68, 19.04, 17.41, and 18.69 for aorta, left main, left anterior descending, right coronary, and left circumflex arteries while they were 13.34, 11.12, 10.96, 9.74, and 8.67 in group B patients. C/N ratios were also higher in all vessels in group A patients, that is, 19.48, 19.48, 19.04, 19.48, and 17.68, compared with group B patients, who had 12.43, 10.03, 9.23, 9.57, and 8.23 ratios (p < 0.0001). No significant difference in IQ per patient and per vessel was seen between both the groups. Discussion Retrospective ECG-gated low-kVp low-volume iodinated contrast protocol provides good diagnostic quality angiograms in patients with BMI up to 31 kg/m2 and with heart rates of less than 100 beats/min with three times reduced radiation dose. The reduced volume of contrast reduces the cost as well as the chance of contrast-induced nephropathy.

Triple rule-out CT angiography protocol with restricting field of view for detection of pulmonary thromboembolism and aortic dissection in emergency department patients: simulation of modified CT protocol for reducing radiation dose

2016 ◽  
Vol 58 (5) ◽  
pp. 521-527 ◽  
Author(s):  
Hyun Su Kim ◽  
Sung Mok Kim ◽  
Min Jae Cha ◽  
Yoo Na Kim ◽  
Hae Jin Kim ◽  
...  
Keyword(s):  
Emergency Department ◽  
Radiation Dose ◽  
Aortic Dissection ◽  
Ct Angiography ◽  
Pulmonary Thromboembolism ◽  
Acute Chest Pain ◽  
Field Of View ◽  
Ct Protocol ◽  
Triple Rule Out ◽  
Rule Out

Background Triple rule-out computed tomography (TRO CT) is a CT protocol designed to simultaneously evaluate the coronary, aorta, and pulmonary arteries. Purpose To evaluate potential diagnostic performance of TRO CT with restricted volume coverage for detection of pulmonary thromboembolism (PTE) and aortic dissection (AD). Material and Methods This study included 1224 consecutive patients with acute chest pain who visited the emergency department and underwent TRO CT using a 128-slice dual-source CT. Image data were reconstructed according to the display field of view (DFOV) of coronary CT angiography (CCTA) and TRO CT protocols in each patient. The presence of PTE and AD was evaluated by independent observers in each DFOV. The radiation dose was calculated to evaluate the potential benefits by restricting z-axis coverage to cardiac scan range instead of the whole thorax. Results Among all patients, 22 cases with PTE (1.9%) and nine cases with AD (0.8%) were found. Except for one PTE case, all cases were detected on both DFOV of TRO CT and CCTA. Mean effective dose for evaluation of entire thorax and cardiac scan coverage were 5.9 ± 1.1 mSv and 3.5 ± 0.7 mSv, respectively. Conclusion Isolated PTE and AD outside the CCTA DFOV rarely occur. Therefore, modified TRO CT protocol using cardiac scan coverage can be adopted to detect PTE and AD with reduced radiation dose.

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