Dual‐source spiral CT with pitch up to 3.2 and 75 ms temporal resolution: Image reconstruction and assessment of image quality

Flohr, Thomas; Leng, Shuai; Yu, Lifeng; Allmendinger, Thomas; Bruder, Herbert; Petersilka, Martin; Eusemann, Christian D.; Stierstorfer, Karl; Schmidt, Bernhard

doi:10.1118/1.3259739

Cited by 166 publications

(118 citation statements)

References 39 publications

Supporting

Mentioning

114

Contrasting

Unclassified

Order By: Relevance

“…In addition, the high sensitivity of the pediatric population to radiation and the cumulative radiation dose in critically ill children require careful handling with this technique [21,22]. Prospectively ECG-triggered high-pitch spiral mode accounts for most effective radiation dose and allows for the examination of the whole heart within a single heartbeat [23][24][25][26]. The feasibility and accuracy of high-pitch CT imaging in children with congenital heart disease has been demonstrated by Han et al [20].…”

Section: Introductionmentioning

confidence: 97%

Third-generation dual-source 70-kVp chest CT angiography with advanced iterative reconstruction in young children: image quality and radiation dose reduction

et al. 2016

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 97%

Third-generation dual-source 70-kVp chest CT angiography with advanced iterative reconstruction in young children: image quality and radiation dose reduction

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Flohr et al [12] reported a theoretical TR value for the DHM at a high pitch factor of 3.2 for a 128-slice DSCT scanner. Our measurements indicated that the maximum TR value of the DHM was 0.074 s (R = 0.285 s; P = 3.2).…”

Section: Discussionmentioning

confidence: 99%

“…In the present study, we analysed the TR and TSP shape of a modern CT scanner, such as a dual source CT (DSCT) scanner [12] and an area detector CT (ADCT) scanner [13] using the impulse method and assessed the actual maximum TR for particular helical acquisition modes.…”

Section: Introductionmentioning

confidence: 99%

Temporal resolution measurement of 128-slice dual source and 320-row area detector computed tomography scanners in helical acquisition mode using the impulse method

et al. 2016

View full text Add to dashboard Cite

Purpose: To analyse the temporal resolution (TR) of modern computed tomography (CT) scanners using the impulse method, and assess the actual maximum TR at respective helical acquisition modes.Methods: To assess the actual TR of helical acquisition modes of a 128-slice dual source CT (DSCT) scanner and a 320-row area detector CT (ADCT) scanner, we assessed the TRs of various acquisition combinations of a pitch factor (P) and gantry rotation time (R).Results: The TR of the helical acquisition modes for the 128-slice DSCT scanner continuously improved with a shorter gantry rotation time and greater pitch factor. However, for the 320-row ADCT scanner, the TR with a pitch factor of <1.0 was almost equal to the gantry rotation time, whereas with pitch factor of >1.0, it was approximately one half of the gantry rotation time. The maximum TR values of single-and dual-source helical acquisition modes for the 128-slice DSCT scanner were 0.138 (R/P = 0.285/1.5) and 0.074 s (R/P = 0.285/3.2), and the 2 maximum TR values of the 64 × 0.5-and 160 × 0.5-mm detector configurations of the helical acquisition modes for the 320-row ADCT scanner were 0.120 (R/P = 0.275/1.375) and 0.195 s (R/P = 0.3/0.6), respectively. Conclusion: Because the TR of a CT scanner is not accurately depicted in the specifications of the individual scanner, appropriate acquisition conditions should be determined based on the actual TR measurement.

show abstract

“…The whole heart is completely scanned within one heart cycle, that is, the topmost image will be acquired at the set trigger point and subsequent images display the heart in later phases of the heart cycle [8][9][10][11].…”

Section: Discussionmentioning

confidence: 99%

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

Ketelsen¹,

Buchgeister²,

Fenchel³

et al. 2012

Fortschr Röntgenstr

View full text Add to dashboard Cite

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.

show abstract

Dual‐source spiral CT with pitch up to 3.2 and 75 ms temporal resolution: Image reconstruction and assessment of image quality

Cited by 166 publications

References 39 publications

Third-generation dual-source 70-kVp chest CT angiography with advanced iterative reconstruction in young children: image quality and radiation dose reduction

Third-generation dual-source 70-kVp chest CT angiography with advanced iterative reconstruction in young children: image quality and radiation dose reduction

Temporal resolution measurement of 128-slice dual source and 320-row area detector computed tomography scanners in helical acquisition mode using the impulse method

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

Contact Info

Product

Resources

About