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Image quality evaluation of iterative model reconstruction on low tube voltage (80 kVp) coronary CT angiography in an animal study.
- Source :
-
Acta radiologica (Stockholm, Sweden : 1987) [Acta Radiol] 2016 Feb; Vol. 57 (2), pp. 170-7. Date of Electronic Publication: 2015 Feb 04. - Publication Year :
- 2016
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Abstract
- Background: Iterative model reconstruction (IMR) is a newer generation iterative reconstruction method, but its value on coronary computed tomography (CT) angiography requires investigation.<br />Purpose: To evaluate coronary image quality using IMR at a low-tube voltage of 80 kVp on coronary CT angiography in miniature pigs.<br />Material and Methods: Five healthy miniature pigs underwent prospective electrocardiogram-gated coronary 256-slice CT angiography at 120 kVp and 80 kVp tube voltages, respectively. Filtered back projection (FBP) was used to reconstruct the 120 kVp standard-dose (SD) image sets (SD-FBP group), while iDose(4) and IMR were used to reconstruct the 80 kVp low-dose (LD) image sets (LD-iDose(4) and LD-IMR groups). Objective and subjective image qualities were compared among three groups.<br />Results: There were no significant differences in mean CT values of the ascending aorta, left main coronary artery, and right coronary artery between the LD-IMR and LD-iDose(4) groups (P > 0.05), but the values were significantly lower in the SD-FBP group than in those two groups (P < 0.05). The image noise in the LD-IMR group (21.5 ± 3.9 HU) was significantly lower than in the LD-iDose(4) (63.7 ± 9.8 HU) and SD-FBP (50.6 ± 4.6 HU) groups (P < 0.05). The signal-to-noise and contrast-to-noise ratios were significantly higher in the LD-IMR group than in the LD-iDose(4) and SD-FBP groups, respectively (P < 0.05). Subjective scoring of image noise, streak artifacts, and overall image quality indicated that the LD-IMR group was consistently superior to the LD-iDose(4) and SD-FBP groups (P < 0.05).<br />Conclusion: IMR can significantly improve image quality at a low-tube voltage (80 kVp) with a 66% radiation dose reduction on coronary 256-slice CT angiography in miniature pigs.<br /> (© The Foundation Acta Radiologica 2015.)
Details
- Language :
- English
- ISSN :
- 1600-0455
- Volume :
- 57
- Issue :
- 2
- Database :
- MEDLINE
- Journal :
- Acta radiologica (Stockholm, Sweden : 1987)
- Publication Type :
- Academic Journal
- Accession number :
- 25657261
- Full Text :
- https://doi.org/10.1177/0284185114568909