Impact of a vendor-specific motion-correction algorithm on image quality, interpretability, and diagnostic performance of daily routine coronary CT angiography: influence of heart rate on the effect of motion-correction

2014 ◽  
Vol 30 (8) ◽  
pp. 1603-1612 ◽  
Author(s):  
Heon Lee ◽  
Jeong A. Kim ◽  
Ji Sung Lee ◽  
Jon Suh ◽  
Sang Hyun Paik ◽  
...  
Keyword(s):  
Heart Rate ◽  
Image Quality ◽  
Ct Angiography ◽  
Motion Correction ◽  
Diagnostic Performance ◽  
Coronary Ct Angiography ◽  
Daily Routine ◽  
Correction Algorithm ◽  
Coronary Ct

scholarly journals Relationship between heart rate and optimal reconstruction phase in coronary CT angiography performed on a 256-slice multidetector CT

2019 ◽  
Vol 92 (1101) ◽  
pp. 20180945 ◽  
Author(s):  
Ching-Ching Yang ◽  
Wei-Yip Law ◽  
Kun-Mu Lu ◽  
Tung-Hsin Wu
Keyword(s):  
Heart Rate ◽  
Image Quality ◽  
Motion Correction ◽  
Coronary Ct Angiography ◽  
Multidetector Ct ◽  
Correction Algorithm ◽  
Coronary Ct ◽  
Optimal Reconstruction ◽  
The Relationship ◽  
Ecg Pulsing

Objective: This study aimed to evaluate the relationship between heart rate (HR) and optimal reconstruction phase in prospectively electrocardiogram (ECG)-triggered coronary CT angiography (CCTA) performed on a newly introduced 256-slice multidetector CT (MDCT). Methods: All the cases were selected retrospectively from the patients scheduled for CCTA in our department between January and April 2017. The scanner selected the optimal exposure phase based on 10 s ECG recordings. To ensure the success of CCTA, the operator also checked patient's age, breathing control, emotional status and past medical history to decide whether the automatically selected scan phase needs manual adjustment or not. Images were reconstructed in 1% steps of the R–R interval to determine the cardiac phase with least coronary motion. If CCTA images showed moderate motion blurring or discontinuity in the course of coronary segments, a cardiac motion correction algorithm was applied to the reconstructed images. Subjective diagnostic image quality was evaluated with 4-point grading scale. Results: A total of 87 consecutive CCTA examinations were investigated in this study. Diastolic reconstruction was applied to all vessel segments in patients with HR <63 bpm, where 36.5 and 77.8% of vessel segments were reconstructed with the use of motion correction in HR ≤57 and 58–62 bpm, respectively. As for patients with HR ≥63 bpm, 89.3 and 71.7% of vessel segments were reconstructed in diastole in HR 63–67 and ≥68 bpm, respectively, while 81 and 100% of vessel segments were reconstructed with the use of motion correction in the same HR groups. Conclusion: Based on our results, a HR less than 67 bpm can be used to identify appropriate patients for diastolic reconstruction. Although the motion correction algorithm is an effective approach to reduce the impact of cardiac motion in CCTA, HR control is still important to optimize the image quality of CCTA. The relationship between HR and optimal reconstruction phase established in this study could be further used to tailor the ECG pulsing window for dose reduction in patients undergoing CCTA performed on the 256-slice MDCT. Advances in knowledge: The HR thresholds to identify patients who are the best suitable candidates for diastolic or systolic reconstruction are scanner specific. This study investigated the relationship between HR and optimal reconstruction phase in prospectively ECG-triggered CCTA for a newly introduced 256-slice MDCT. Once the relationship is established, it could be used to tailor the ECG pulsing window for radiation dose reduction.

Impact of a New Motion-Correction Algorithm on Image Quality of Low-Dose Coronary CT Angiography in Patients with Insufficient Heart Rate Control

2014 ◽  
Vol 21 (3) ◽  
pp. 312-317 ◽  
Author(s):  
Tobias A. Fuchs ◽  
Julia Stehli ◽  
Svetlana Dougoud ◽  
Michael Fiechter ◽  
Bert-Ram Sah ◽  
...  
Keyword(s):  
Heart Rate ◽  
Image Quality ◽  
Rate Control ◽  
Motion Correction ◽  
Coronary Ct Angiography ◽  
Low Dose ◽  
Correction Algorithm ◽  
Heart Rate Control ◽  
Coronary Ct

Appropriate use of a beta-blocker in paediatric coronary CT angiography

2018 ◽  
Vol 28 (10) ◽  
pp. 1148-1153 ◽  
Author(s):  
Hirofumi Watanabe ◽  
Hiroshi Kamiyama ◽  
Masataka Kato ◽  
Akiko Komori ◽  
Yuriko Abe ◽  
...  
Keyword(s):  
Heart Rate ◽  
Image Quality ◽  
Adverse Events ◽  
Radiation Exposure ◽  
Ct Angiography ◽  
Beta Blocker ◽  
Coronary Ct Angiography ◽  
Standard Dose ◽  
High Heart Rate ◽  
Coronary Ct

AbstractBackgroundThere is no standard dose or protocol for beta-blocker administration as preconditioning in children undergoing coronary CT angiography.MethodsA total of 63 consecutive patients, with a mean age of 10.0±3.1 years, who underwent coronary CT angiography to assess possible coronary complications were enrolled in a single-centre, retrospective study. All patients were given an oral beta-blocker 1 hour before coronary CT angiography. Additional oral beta-blocker or intravenous beta-blocker was given to those with a high heart rate. We compared image quality, radiation exposure, and adverse events among the patients without additional beta-blocker, with additional oral beta-blocker, and with additional intravenous beta-blocker.ResultsThere were no significant differences in image quality or radiation exposure among the groups. The heart rate just before scanning was significantly correlated with image quality (p<0.001, r=−0.533) but was not correlated with radiation exposure (p=0.45, r=0.096). There were no adverse events related to any allergic reaction, thereby showing the effectiveness of the beta-blocker.ConclusionInitial oral beta-blocker administration (0.8 mg/kg/dose) should be administered to all children undergoing coronary CT angiography. Additional intravenous beta-blocker should be given to those with poor heart rate control to improve image quality without increasing radiation exposure or allowing adverse events.

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