High-pitch spiral acquisition: A new scan mode for coronary CT angiography

Achenbach, Stephan; Marwan, Mohamed; Schepis, Tiziano; Pflederer, Tobias; Bruder, Herbert; Allmendinger, Thomas; Petersilka, Martin; Anders, Katharina; Lell, Michael; Kuettner, Axel; Ropers, Dieter; Daniel, Werner G.; Flohr, Thomas

doi:10.1016/j.jcct.2009.02.008

Cited by 235 publications

(166 citation statements)

References 20 publications

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“…In single-source CT systems, the pitch factor is limited to a maximum of approximately 1.5 to provide gapless volume coverage. The recently introduced second generation dual-source CT (DSCT) system-owing to the geometry of the two detector elements-is equipped with a high-pitch data acquisition mode with pitch values of up to 3.4 [5]. By filling the gaps left behind by the first detectorsystem with data acquired by the second detector, this highpitch mode reduces the duration of a CT data acquisition of the entire chest to below 1 s [6] and allows for CT angiographies of the thoracic aorta at radiation dose values around 1 mSv [7].…”

Section: Introductionmentioning

confidence: 99%

High-pitch dual-source CT angiography of the aortic valve-aortic root complex without ECG-synchronization

et al. 2010

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Purpose To compare image quality and radiation dose of high-pitch computed tomography angiography(CTA) of the aortic valve-aortic root complex with and without prospective ECG-gating compared to a retrospectively ECG-gated standard-pitch acquisition. Materials and Methods 120 patients(mean age 68 ± 13 years) were examined using a 128-slice dual-source CT system using prospectively ECG-gated high-pitch (group A; n=40), non-ECG-gated high-pitch(group B; n= 40) or retrospectively ECG-gated standard-pitch(C; n=40) acquisition techniques. Image quality of the aortic root, valve and ascending aorta including the coronary ostia was assessed by two independent readers. Image noise was measured, radiation dose estimates were calculated. Results Interobserver agreement was good(κ=0.64-0.78). Image quality was diagnostic in 38/40 patients(group A), 37/40(B) and 38/40(C) with no significant difference in number of patients with diagnostic image quality among all groups (p = 0.56). Significantly more patients showed excellent image quality in group A compared to groups B and C(each, p<0.01). Average image noise was significantly different between all groups(p<0.05). Mean radiation dose estimates in groups A and B(each; 2.4±0.3 mSv) were significantly lower compared to group C(17.5±4.4 mSv; p<0.01). Conclusion High-pitch dual-source CTA provides diagnostic image quality of the aortic valve-aortic root complex even without ECG-gating at 86% less radiation dose when compared to a standard-pitch ECG-gated acquisition.

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Section: Introductionmentioning

confidence: 99%

High-pitch dual-source CT angiography of the aortic valve-aortic root complex without ECG-synchronization

et al. 2010

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“…Typically, the pitch is less than 1, usually between 0.2 and 0.5 in first-generation dualsource CTCA resulting in relevant overlaps by advancing the table much less than one detector width during one scanner rotation [3,7]. Thus, repeated exposure of the same heart region during several consecutive rotations causes an increase of radiation exposure.…”

Section: Discussionmentioning

confidence: 99%

“…A diagnostic image quality can be achieved in 97% of coronary segments with high-pitch CTCA [16][17][18]. These studies recommend this prospective, R-wave triggered, highpitch scanning mode for patients with low and regular heart rates (<55-60 beats per minute) to acquire the complete dataset before the onset of atrial contraction [7,9,10].…”

Section: Discussionmentioning

confidence: 99%

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High-Pitch Computed Tomography Coronary Angiography – A New Dose Saving Algorithm: Estimation of Radiation Exposure

Ketelsen¹,

Buchgeister²,

Fenchel³

et al. 2012

Fortschr Röntgenstr

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properly cited.Purpose. To estimate effective dose and organ equivalent doses of prospective ECG-triggered high-pitch CTCA. Materials and Methods. For dose measurements, an Alderson-Rando phantom equipped with thermoluminescent dosimeters was used. The effective dose was calculated according to ICRP 103. Exposure was performed on a second-generation dual-source scanner (SOMATOM Definition Flash, Siemens Medical Solutions, Germany). The following scan parameters were used: 320 mAs per rotation, 100 and 120 kV, pitch 3.4 for prospectively ECG-triggered high-pitch CTCA, scan range of 13.5 cm, collimation 64 × 2 × 0.6 mm with z-flying focal spot, gantry rotation time 280 ms, and simulated heart rate of 60 beats per minute. Results. Depending on the applied tube potential, the effective whole-body dose of the cardiac scan ranged from 1.1 mSv to 1.6 mSv and from 1.2 to 1.8 mSv for males and females, respectively. The radiosensitive breast tissue in the range of the primary beam caused an increased female-specific effective dose of 8.6%±0.3% compared to males. Decreasing the tube potential, a significant reduction of the effective dose of 35.8% and 36.0% can be achieved for males and females, respectively (P < 0.001). Conclusion. The radiologist and the CT technician should be aware of this new dose-saving strategy to keep the radiation exposure as low as reasonablly achievable.

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“…Current technologies enable single-heartbeat CCTA with wide-area detectors [2], dual source technique or high pitch acquisition [3]. This leads to a substantial reduction in scan acquisition time (< 1 -6 s, depending on scan protocol) as well as a decrease in motion artifacts due to breathing and coronary motion [4].…”

Section: Introductionmentioning

confidence: 99%

Contrast Media Administration in Coronary Computed Tomography Angiography – A Systematic Review

Mihl

Maas

Turek

et al. 2017

Fortschr Röntgenstr

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High-pitch spiral acquisition: A new scan mode for coronary CT angiography

Cited by 235 publications

References 20 publications

High-pitch dual-source CT angiography of the aortic valve-aortic root complex without ECG-synchronization

High-pitch dual-source CT angiography of the aortic valve-aortic root complex without ECG-synchronization

High-Pitch Computed Tomography Coronary Angiography – A New Dose Saving Algorithm: Estimation of Radiation Exposure

Contrast Media Administration in Coronary Computed Tomography Angiography – A Systematic Review

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