Narrowing the phase window width in prospectively ECG-gated single heart beat 320-detector row coronary CT angiography

Steigner, Michael L.; Otero, Hansel J.; Cai, Tianxi; Mitsouras, Dimitrios; Nallamshetty, Leelakrishna; Whitmore, Amanda G.; Ersoy, Hale; Levit, Noah A; Carli, Marcelo F. Di; Rybicki, Frank J.

doi:10.1007/s10554-008-9347-8

Cited by 153 publications

(111 citation statements)

References 8 publications

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Section: Introductionmentioning

confidence: 99%

“…In the LPS mode, CT data are acquired throughout the cardiac cycle, and the data required for the reconstruction phase are chosen retrospectively (6) . In the SAS mode, CT data are only acquired over a fraction of the R–R interval (6) . The SAS mode results in low radiation exposure during CTCA and provides high diagnostic accuracy in the assessment of coronary artery disease; however, it can be applied only in patients with stable sinus rhythms and low heart rates (7) .…”

Section: Introductionmentioning

confidence: 99%

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Radiation dose and physical image quality in 128‐section dual‐source computed tomographic coronary angiography: a phantom study

Matsubara¹,

Koshida²,

Sakuta³

et al. 2012

J Applied Clin Med Phys

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One‐hundred‐and‐twenty‐eight–section dual X‐ray source computed tomography (CT) systems have been introduced into clinical practice and have been shown to increase temporal resolution. Higher temporal resolution allows low‐dose spiral mode at a high pitch factor during CT coronary angiography. We evaluated radiation dose and physical image qualities in CT coronary angiography by applying high‐pitch spiral, step‐and‐shoot, and low‐pitch spiral modes to determine the optimal acquisition mode for clinical situations. An anthropomorphic phantom, small dosimeters, a calibration phantom, and a microdisc phantom were used to evaluate the radiation doses absorbed by thoracic organs, noise power spectrums, in‐plane and z‐axis modulation transfer functions, slice sensitivity profiles, and number of artifacts for the three acquisition modes. The high‐pitch spiral mode had the advantage of a small absorbed radiation dose, but provided low image quality. The low‐pitch spiral mode resulted in a high absorbed radiation dose of approximately 200 mGy for the heart. Although the absorbed radiation dose was lower in the step‐and‐shoot mode than in the low‐pitch spiral mode, the noise power spectrum was inferior. The quality of the in‐plane modulation transfer function differed, depending on spatial frequency. Therefore, the step‐and‐shoot mode should be applied initially because of its low absorbed radiation dose and superior image quality.PACS numbers: 87.57.‐s; 87.57.C‐; 87.57.cf; 87.57.cm; 87.57.cp; 87.57.Q‐; 87.57.qp; 87.57.uq

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Radiation dose and physical image quality in 128‐section dual‐source computed tomographic coronary angiography: a phantom study

Matsubara¹,

Koshida²,

Sakuta³

et al. 2012

J Applied Clin Med Phys

View full text Add to dashboard Cite

show abstract

“…With this technique, radiation is only used during a specific phase of the cardiac cycle. The duration of this window can be adjusted, thereby reducing radiation dose on a case-by-case basis (30). In general, the radiation dose for prospectively gated CTA is dramatically reduced to a mean dose of 2.4 mSv to 4.2 mSv (31-35).…”

Section: Radiation Riskmentioning

confidence: 99%

The ‘what, when, where, who and how?’ of cardiac computed tomography in 2009: Guidelines for the clinician

Chow

Larose

Bilodeau

et al. 2009

Canadian Journal of Cardiology

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“…The patients' heart rate during image acquisition remains a critical determinant of radiation dose and image quality (8)(9)(10). Administration of beta blockers reduces heart rate and heart rate variability and results in better image…”

Section: Introductionmentioning

confidence: 99%

Superior CT Coronary Angiography Image Quality at Lower Radiation Exposure with Second Generation 320-Detector-Row CT in Patients with Elevated Heart Rate – A Comparison with First Generation 320-Detector-Row CT

Soh

Wong

et al. 2013

Heart, Lung and Circulation

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Background: This study aims to compare the image quality of second generation versus first generation 320-computed tomography coronary angiography (CTCA) in patients with heart rate ≥65 bpm as it has not been specifically reported.Methods: Consecutive patients who underwent CTCA using second-generation-320-detector-row-CT were prospectively enrolled. A total of 50 patients with elevated (≥65 bpm) heart rate and 50 patients with controlled (<65 bpm) heart rate were included. Age and gender matched patients who were scanned with the first-generation-320-detector-row-CT were retrospectively identified. Image quality in each coronary artery segment was assessed by two blinded CT angiographers using the five-point Likert scale.Results: In the elevated heart rate cohorts, while there was no significant difference in heart rate during scan-acquisition (66 vs. 69 bpm, P=0.308), or body mass index (28.5 vs. 29.6, P=0.464), the second generation scanner was associated with better image quality (3.94±0.6 vs. 3.45±0.8, P=0.001), and with lower radiation (2.8 vs. 4.3 mSv, P=0.009). There was no difference in scan image quality for the controlled heart rate cohorts. Conclusions:The second generation CT scanner provides better image quality at lower radiation dose in patients with elevated heart rate (≥65 bpm) compared to first generation CT scanner.

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Narrowing the phase window width in prospectively ECG-gated single heart beat 320-detector row coronary CT angiography

Abstract: For prospectively ECG-gated single heart beat coronary CTA, a phase window width of 10% will reduce patient radiation and yield diagnostic images in >90% of patients. Heart rate control is an important component of 320-detector row prospectively gated CT dose reduction.

Cited by 153 publications

References 8 publications

Radiation dose and physical image quality in 128‐section dual‐source computed tomographic coronary angiography: a phantom study

Radiation dose and physical image quality in 128‐section dual‐source computed tomographic coronary angiography: a phantom study

The ‘what, when, where, who and how?’ of cardiac computed tomography in 2009: Guidelines for the clinician

Superior CT Coronary Angiography Image Quality at Lower Radiation Exposure with Second Generation 320-Detector-Row CT in Patients with Elevated Heart Rate – A Comparison with First Generation 320-Detector-Row CT

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