Low-Dose CT of the Paranasal Sinuses: Minimizing X-Ray Exposure with Spectral Shaping

Objectives Shaping the energy spectrum of the X-ray beam has been shown to be beneficial in low-dose CT. This study’s aim was to investigate dose and image quality of tin filtration at 100 kV for pre-operative planning in low-dose paranasal CT imaging in a large patient cohort. Methods In a prospect...

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Bibliographic Details
Published in:European radiology 2016-11, Vol.26 (11), p.4155-4161
Main Authors: Wuest, Wolfgang, May, Matthias, Saake, Marc, Brand, Michael, Uder, Michael, Lell, Michael
Format: Article
Language:English
Subjects:
Adolescent
Adult
Aged
Aged, 80 and over
Child
Diagnostic Radiology
Female
Head and Neck
Humans
Imaging
Internal Medicine
Interventional Radiology
Male
Medicine
Medicine & Public Health
Middle Aged
Multidetector Computed Tomography - methods
Neuroradiology
Paranasal Sinuses - diagnostic imaging
Patients
Phantoms, Imaging
Planning
Prospective Studies
Radiation
Radiation Dosage
Radiation Protection - instrumentation
Radiology
Sinuses
Sinusitis - diagnostic imaging
Surgery
Tomography
Ultrasound
X-Rays
Young Adult
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Summary:Objectives Shaping the energy spectrum of the X-ray beam has been shown to be beneficial in low-dose CT. This study’s aim was to investigate dose and image quality of tin filtration at 100 kV for pre-operative planning in low-dose paranasal CT imaging in a large patient cohort. Methods In a prospective trial, 129 patients were included. 64 patients were randomly assigned to the study protocol (100 kV with additional tin filtration, 150mAs, 192x0.6-mm slice collimation) and 65 patients to the standard low-dose protocol (100 kV, 50mAs, 128 × 0.6-mm slice collimation). To assess the image quality, subjective parameters were evaluated using a five-point scale. This scale was applied on overall image quality and contour delineation of critical anatomical structures. Results All scans were of diagnostic image quality. Bony structures were of good diagnostic image quality in both groups, soft tissues were of sufficient diagnostic image quality in the study group because of a high level of noise. Radiation exposure was very low in both groups, but significantly lower in the study group (CTDI vol 1.2 mGy vs. 4.4 mGy, p  
ISSN:0938-7994
1432-1084
DOI:10.1007/s00330-016-4263-0