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

Journal article

Publication Details

Author(s): Wüst W, May M, Saake M, Brand M, Uder M, Lell M
Journal: European Radiology
Publication year: 2016
Volume: 26
Journal issue: 11
Pages range: 4155-4161
ISSN: 0938-7994


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.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.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 (CTDIvol 1.2 mGy vs. 4.4 mGy, p < 0.001).Spectral optimization (tin filtration at 100 kV) allows for visualization of the paranasal sinus with sufficient image quality at a very low radiation exposure.o Spectral optimization (tin filtration) is beneficial to low-dose parasinus CT o Tin filtration at 100 kV yields sufficient image quality for pre-operative planning o Diagnostic parasinus CT can be performed with an effective dose <0.05 mSv.

FAU Authors / FAU Editors

Lell, Michael Prof. Dr.
Medizinische Fakultät
May, Matthias PD Dr.
Radiologisches Institut
Uder, Michael Prof. Dr.
Lehrstuhl für Diagnostische Radiologie
Wüst, Wolfgang PD Dr.
Medizinische Fakultät

How to cite

Wüst, W., May, M., Saake, M., Brand, M., Uder, M., & Lell, M. (2016). Low-Dose CT of the Paranasal Sinuses: Minimizing X-Ray Exposure with Spectral Shaping. European Radiology, 26(11), 4155-4161. https://dx.doi.org/10.1007/s00330-016-4263-0

Wüst, Wolfgang, et al. "Low-Dose CT of the Paranasal Sinuses: Minimizing X-Ray Exposure with Spectral Shaping." European Radiology 26.11 (2016): 4155-4161.


Last updated on 2018-07-10 at 02:47