Dose and image quality at CT pulmonary angiography— comparison of first and second generation dual-energy CT and 64-slice CT
- نوع فایل : کتاب
- زبان : انگلیسی
- مؤلف : Ralf W. Bauer & Sebastian Kramer & Matthias Renker & Boris Schell & Maya Christina Larson & Martin Beeres & Thomas Lehnert & Volkmar Jacobi & Thomas
- چاپ و سال / کشور: 2011
Description
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.
Eur Radiol DOI 10.1007/s00330-011-2162-y Received: 2 March 2011 / Accepted: 17 May 2011
