scholarly journals Radiation Dose and Image Quality of a High-Pitch Prospective Spiral First Approach in Coronary Computed Tomography Angiography (CCTA)

2021 ◽  
Vol 8 (10) ◽  
pp. 119
Author(s):  
Tom Finck ◽  
Konstantin Klambauer ◽  
Eva Hendrich ◽  
Albrecht Will ◽  
Stefan Martinoff ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Image Quality ◽  
Radiation Exposure ◽  
Computed Tomography Angiography ◽  
Coronary Computed Tomography Angiography ◽  
Diagnostic Yield ◽  
Diagnostic Image Quality ◽  
High Pitch ◽  
Coronary Computed Tomography

Objective: To investigate a high-pitch spiral first (HPSF) approach for coronary computed tomography angiography (CCTA) in an unselected patient cohort and compare diagnostic yield and radiation exposure to CCTAs acquired via conventional, non-high-pitch spiral first (NHPSF) scan regimes. Materials and Methods: All consecutive patients from 1 January 2015 to 31 December 2017 were included. Two investigation protocols (HPSF/NHPSF) were used with the aim to achieve diagnostic image quality of all coronary segments. Low-pitch secondary scans followed the initial examination if image quality was unsatisfactory. Dosage and image quality were compared between both regimes. Results: 1410 patients were subject to a HPSF and 236 patients to a NHPSF approach. While the HPSF approach led to a higher fraction of re-scans (35% vs. 11%, p < 0.001), the fraction of aggregate scans that remained non-diagnostic after considering the initial and secondary scan was comparably low for the HPSF and NHPSF approach (0.78 vs. 0%, p = 0.18). Aggregate radiation exposure in the HPSF protocol was significantly lower (1.12 mSv (IQR: 0.73, 2.10) vs. 3.96 mSv (IQR: 2.23, 8.33) p < 0.001). Conclusions: In spite of a higher number of re-scans, a HPSF approach leads to a reduction in overall radiation exposure with diagnostic yields similar to a NHPSF approach.

scholarly journals Diagnostic Phase of Calcium Scoring Scan Applied as the Center of Acquisition Window of Coronary Computed Tomography Angiography Improves Image Quality in Minimal Acquisition Window Scan (Target CTA Mode) Using the Second Generation 320-Row CT

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Eriko Maeda ◽  
Kodai Yamamoto ◽  
Shigeaki Kanno ◽  
Kenji Ino ◽  
Nobuo Tomizawa ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Image Quality ◽  
Computed Tomography Angiography ◽  
Cardiac Ct ◽  
Coronary Computed Tomography Angiography ◽  
Calcium Scoring ◽  
Acquisition Window ◽  
Coronary Computed Tomography ◽  
The Mean

Objective.To compare the image quality of coronary computed tomography angiography (CCTA) acquired under two conditions: 75% fixed as the acquisition window center (Group 75%) and the diagnostic phase for calcium scoring scan as the center (CS; Group CS).Methods.320-row cardiac CT with a minimal acquisition window (scanned using “Target CTA” mode) was performed on 81 patients. In Group 75% (n= 40), CS was obtained and reconstructed at 75% and the center of the CCTA acquisition window was set at 75%. In Group CS (n= 41), CS was obtained at 75% and the diagnostic phase showing minimal artifacts was applied as the center of the CCTA acquisition window. Image quality was evaluated using a four-point scale (4-excellent) and the mean scores were compared between groups.Results.The CCTA scan diagnostic phase occurred significantly earlier in CS (75.7 ± 3.2% vs. 73.6 ± 4.5% for Groups 75% and CS, resp.,p= 0.013). The mean Group CS image quality score (3.58 ± 0.63) was also higher than that for Group 75% (3.19 ± 0.66,p< 0.0001).Conclusions.The image quality of CCTA in Target CTA mode was significantly better when the center of acquisition window is adjusted using CS.

scholarly journals Contrast medium administration with a body surface area protocol in step-and-shoot coronary computed tomography angiography with dual-source scanners

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Liang Jin ◽  
Yiyi Gao ◽  
Yingli Sun ◽  
Cheng Li ◽  
Pan Gao ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Image Quality ◽  
Contrast Medium ◽  
Surface Area ◽  
Body Surface Area ◽  
Body Surface ◽  
Computed Tomography Angiography ◽  
Coronary Computed Tomography Angiography ◽  
Diagnostic Image Quality ◽  
Coronary Computed Tomography

Abstract We evaluated the feasibility and image quality of prospective electrocardiography (ECG)-triggered coronary computed tomography angiography (CCTA) using a body surface area (BSA) protocol for contrast-medium (CM) administration on both second- and third-generation scanners (Flash and Force CT), without using heart rate control. One-hundred-and-eighty patients with suspected coronary heart disease undergoing CCTA were divided into groups A (BSA protocol for CM on Flash CT), B (body mass index (BMI)-matched patients; BMI protocol for CM on Flash CT), and C (BMI-matched patients; BSA protocol for CM on Force CT). Patient characteristics, quantitative and qualitative measures, and radiation dose were compared between groups A and B, and A and C. Of the 180 patients, 99 were male (median age, 62 years). Average BSA in groups A, B, and C was 1.80 ± 0.17 m2, 1.74 ± 0.16 m2, and 1.64 ± 0.17 m2, respectively, with groups A and C differing significantly (P < 0.001). Contrast volume (50.50 ± 8.57 mL vs. 45.00 ± 6.18 mL) and injection rate (3.90 ± 0.44 mL/s vs. 3.63 ± 0.22 mL/s) differed significantly between groups A and C (P < 0.001). Groups A and C (both: all CT values > 250 HU, average scores > 4) achieved slightly lower diagnostic image quality than group B. The BSA protocol for CM administration was feasible in both Flash and Force CT, and therefore may be valuable in clinical practice.

Sign in / Sign up

Export Citation Format

Share Document