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Sparse-sampling computed tomography for detection of endoleak after endovascular aortic repair (EVAR).
- Source :
-
European Journal of Radiology . Sep2021, Vol. 142, pN.PAG-N.PAG. 1p. - Publication Year :
- 2021
-
Abstract
- <bold>Objectives: </bold>To evaluate sparse sampling computed tomography (SpSCT) for detection of endoleak after endovascular aortic repair (EVAR) at different dose levels in terms of subjective image criteria and diagnostic accuracy.<bold>Methods: </bold>Twenty clinically indicated computed tomography aortic angiography (CTA) scans were used to obtain simulated low-dose scans with 100%, 50%, 25%, 12.5% and 6.25% of the applicated clinical dose, resulting in five dose levels (DL). From full sampling (FS) data sets, every second (2-SpSCT) or fourth (4-SpSCT) projection was used to generate simulated sparse sampling scans. All examinations were evaluated by four blinded radiologists regarding subjective image criteria and diagnostic performance.<bold>Results: </bold>Sensitivity was higher than 93% in 4-SpSCT at the 25% DL which is the same as with FS at full dose (100% DL). High accuracies and relative high AUC-values were obtained for 2- and 4-SpSCT down to the 12.5% DL, while for FS similar values were shown down to 25% DL only. Subjective image quality was significantly higher for 4-SpSCT compared to FS at each dose level. More than 90% of all cases were rated with a high or medium confidence for FS and 2-SpSCT at the 50% DL and for 4-SpSCT at the 25% DL. At DL 25% and 12.5%, more cases showed a high confidence using 2- and 4-SpSCT compared with FS.<bold>Conclusions: </bold>Via SpSCT, a dose reduction down to a 25% dose level (mean effective dose of 1.49 mSv in the current study) for CTA is possible while maintaining high image quality and full diagnostic confidence. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 0720048X
- Volume :
- 142
- Database :
- Academic Search Index
- Journal :
- European Journal of Radiology
- Publication Type :
- Academic Journal
- Accession number :
- 152003321
- Full Text :
- https://doi.org/10.1016/j.ejrad.2021.109843