Low-dose non-contrast examination of the temporal bone using volumetric 320-row computed tomography

Abstract

Background

320-row volume computed tomography (CT) allows CT dose to be reduced while maintaining image quality.

Purpose

To evaluate image quality of low-dose non-contrast temporal bone CT using single volumetric 320-row multidetector CT technique.

Material and Methods

A total of 125 patients were included in our study. Two low-dose protocols, including 135 kV tube voltage with 5 mAs tube current and 80 kV tube voltage with 5 mAs tube current, were chosen based on results of present phantom study. For evaluating subjective image quality, conspicuity of anatomic landmarks were assigned a score using a five-point scale. Objective image quality analysis was performed by analyzing regions of interest on axial soft-tissue and bone reconstructions. Effective dose was calculated from dose-length product.

Results

Mean effective radiation dose for 120 kV and 75 mAs protocol (control group) was 0.29 ± 0.04 mSv; for 135 kV and 5 mAs protocol (study group A), this value was 0.02 ± 0. 003 mSv; and for 80 kV and 5 mAs protocol (study group B), this value was 0.005 ± 0. 0009 mSv. Mean effective radiation doses of study group A and B were significantly lower than the control group (P < 0.001). Study group A and control group images showed no significant difference in image quality except for some anatomic landmarks. Study group B images had lower image quality than control group images.

Conclusions

Temporal bone CT with 135 kVp and 5 mAs can be performed at very low radiation exposure while maintaining high image quality.

Keywords

Low dose temporal bone 320-row detector CT

Get full access to this article

View all access options for this article.

References

Bauknecht

Siebert

Dannenberg

et al . Image quality and radiation exposure in 320- row temporal bone computed tomography. Dentomaxillofac Radiol 2010; 39:199–206.

Trojanowska

Drop

Trojanowski

et al . External and middle ear diseases: radiological diagnosis based on clinical signs and symptoms. Insights Imaging 2012; 3:33–48.

Linet

Kim

Rajaraman

Children’s exposure to diagnostic medical radiation and cancer risk: epidemiologic and dosimetric considerations.

Pediatr Radiol 2009: 39:4–26.

Tada

Sato

Masaoka

et al . Imaging of the temporal bone in children using low-dose 320-row area detector computed tomography. J Med Imaging Radiat Oncol 2017; 61:489–493.

Wuest

May

Saake

et al . Low-dose CT of the paranasal sinuses: minimizing X-ray exposure with spectral shaping. Eur Radiol 2016; 26:4155–4161.

Edward

Rybicki

Steigner

CT coronary angiography: 256-slice and 320-detector row scanners.

Curr Cardiol Rep 2010; 12:68–75.

Nauer

Zubler

Weisstanner

et al . Radiation dose optimization in pediatric temporal bone computed tomography: influence of tube tension on image contrast and image quality. Neuroradiology 2012; 54:247–254.

Nauer

Rieke

Zubler

et al . Low-dose temporal bone CT in infants and young children: effective dose and image quality. Am J Neuroradiol 2011; 32:1375–1380.

Schwab

Eberle

Adamietz

et al . Comparison of 128-section single-shot technique with conventional spiral multisection CT for imaging of the temporal bone. Am J Neuroradiol 2012; 33:55–60.

10.

Mulkens

Bellinck

Baeyaert

et al . Use of an automatic exposure control mechanism for dose optimization in multi-detector row CT examinations: clinical evaluation. Radiology 2005; 237:213–223.

11.

Kalender

Buchenau

Deak

et al . Technical approaches to the optimisation of CT. Phys Med 2008; 24:71–79.

12.

Gervaise

Osemont

Lecocq

et al . CT image quality improvement using Adaptive Iterative Dose Reduction with wide-volume acquisition on 320-detector CT. Eur Radiol 2012; 22:295–301.

13.

Wang

Improving depiction of temporal bone anatomy with lowradiation dose CT by an integrated circuit detector in pediatric patients: a preliminary study.

Medicine (Baltimore) 2014; 93:325.

14.

American Association of Physicists in Medicine. The measurement, reporting, and management of radiation dose in CT. AAPM Report No. 96. College Park, MD: AAPM, 2008.

15.

Radimetrics. Available at: https://www.radiologysolutions.bayer.com/products/ct/dosemanagement/rep/ (accessed 29 June 2016).

16.

Nievelstein

van Dam

van der Molen

AJ.

Multidetector CT in children: current concepts and dose reduction strategies.

Pediatr Radiol 2010; 40:1324–1344.

17.

Podberesky

Angel

Yoshizumi

et al . Comparison of radiation dose estimates and scan performance in pediatric high-resolution thoracic CT for volumetric 320-detector row, helical 64-detector row, and noncontiguous axial scan acquisitions. Acad Radiol 2013; 20:1152–1161.

18.

Johnston

Podberesky

Yoshizumi

et al . Comparison of radiation dose estimates, image noise, and scan duration in pediatric body imaging for volumetric and helical modes on 320-detector CT and helical mode on 64-detector CT. Pediatr Radiol 2013; 43:1117–1127.

19.

Sorantin

Riccabona

Stücklschweiger

et al . Experience with volumetric (320 rows) pediatric CT. Eur J Radiol 2013; 82:1091–1097.

20.

Kim

Jeon

JY.

Radiation dose and image conspicuity comparison between conventional 120 kVp and 150 kVp with spectral beam shaping for temporal bone CT.

Eur J Radiol 2018; 102:68–73.

Supplementary Material

Please find the following supplemental material available below.

For Open Access articles published under a Creative Commons License, all supplemental material carries the same license as the article it is associated with.

For non-Open Access articles published, all supplemental material carries a non-exclusive license, and permission requests for re-use of supplemental material or any part of supplemental material shall be sent directly to the copyright owner as specified in the copyright notice associated with the article.

0.00 MB

0.50 MB