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Eur Radiol. 2011 Oct;21(10):2139-47. doi: 10.1007/s00330-011-2162-y. Epub 2011 May 27.

Dose and image quality at CT pulmonary angiography-comparison of first and second generation dual-energy CT and 64-slice CT.

Author information

1
Department of Diagnostic and Interventional Radiology, Clinic of the Goethe University, Frankfurt am Main, Germany. ralfwbauer@aol.com

Abstract

OBJECTIVE:

To compare dose and image quality of 64-slice, first and second generation dual-energy CT (DECT) for CT pulmonary angiography (CTPA).

METHODS:

Totally 120 patients, 30 in each group, underwent CTPA on a first generation (group 1: single-energy, 120 kV/145 mAs; group 2: DE, 140/80 kV, 70/350 mAs) or second generation dual-source DECT device (group 3: DE, 100/Sn140 kV, 120/102 mAs; group 4: DE, 80/Sn140 kV, 202/86 mAs). CTDIvol, DLP, background noise (BN), thorax diameter and attenuation in the pulmonary trunk were compared.

RESULTS:

Thorax diameter and attenuation in the pulmonary trunk did not differ significantly (p > 0.4 and >0.19) between the groups. Mean CTDIvol and DLP were significantly lower (p < 0.003) in group 4 (6.2 ± 1.6 mGy/170 ± 41 mGycm) compared to group 1 (8.5 ± 2.6 mGy/235 ± 117 mGycm), group 2 (9.2 ± 3.3 mGy/224 ± 122 mGycm) and group 3 (8.7 ± 2.8 mGy/246 ± 86 mGycm). BN was significantly lower (p < 0.0001) in group 4 (12 ± 3 HU) and group 1 (13 ± 6 HU) compared to group 3 and 2 (16 ± 6 HU and 23 ± 9).

CONCLUSION:

The use of second generation DECT in 80/Sn140 kV configuration allows for significant dose reduction with image quality similar to 120 kV CTPA.

PMID:
21614614
DOI:
10.1007/s00330-011-2162-y
[Indexed for MEDLINE]

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