Wide-detector axial CT versus 4 cm detector helical CT for transcatheter aortic valve replacement: iodine dose, radiation, and image quality.
OBJECTIVE
This study aims to compare transcatheter aortic valve replacement (TAVR) planning on 16 cm wide-detector computed tomography (CT) to TAVR planning on 4 cm detector CT.


METHODS
A total of 36 patients who had TAVR planning axial CT on a wide-detector scanner (protocol 1) were compared to 36 patients who had helical 4 cm detector CT (protocol 2).


RESULTS
Vascular attenuation was greater for protocol 1, but image noise, contrast-to-noise ratio, and signal-to-noise ratio were the same. Radiation dose was lower and iodine dose was less for protocol 1.


CONCLUSIONS
Protocol 1 had greater vascular attenuation and similar image quality but lower radiation and less iodine compared to protocol 2.
University of Washington, Department of Radiology, Box 357115, 1959 NE Pacific Street, USA, Seattle, WA, 98195. Electronic address: wshuman@uw.edu.
William P
WP
Shuman
University of Washington, Department of Radiology, Box 357115, 1959 NE Pacific Street, USA, Seattle, WA, 98195.
Doug E
DE
Green
University of Washington, Department of Radiology, Box 357115, 1959 NE Pacific Street, USA, Seattle, WA, 98195.
Janet M
JM
Busey
University of Washington, Department of Radiology, Box 357115, 1959 NE Pacific Street, USA, Seattle, WA, 98195.
Mario M
MM
Ramos
University of Washington, Department of Medicine, Division of Cardiology, Box 356422, 1959 NE Pacific Street, USA, Seattle, WA, 98195.
Kelley R
KR
Branch
University of Washington, Department of Radiology, Box 357115, 1959 NE Pacific Street, USA, Seattle, WA, 98195.
Kent M
KM
Koprowicz
University of Washington, Department of Radiology, Box 357115, 1959 NE Pacific Street, USA, Seattle, WA, 98195.
Kalpana M
KM
Kanal
D000368:Aged; D003287:Contrast Media / Q000008:administration & dosage*; D005260:Female; D006801:Humans; D007089:Image Enhancement; D007455:Iodine / Q000008:administration & dosage*; D008297:Male; D011829:Radiation Dosage; D012189:Retrospective Studies; D059629:Signal-To-Noise Ratio; D036542:Tomography, Spiral Computed / Q000379:methods*; D014057:Tomography, X-Ray Computed / Q000379:methods*; D065467:Transcatheter Aortic Valve Replacement
D003287:Contrast Media; D007455:Iodine
Axial step-and-shoot CT; Computed tomography; Iodine dose; TAVR planning CT; Wide-detector CT