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Low-Dose Noncontrast Examination of the Paranasal Sinuses Using Volumetric Computed Tomography

Pirimoglu, Berhan, MD*; Sade, Recep, MD*; Sakat, Muhammed Sedat, MD; Ogul, Hayri, MD*; Levent, Akin, MD*; Kantarci, Mecit, MD, PhD*

Journal of Computer Assisted Tomography: May/June 2018 - Volume 42 - Issue 3 - p 482–486
doi: 10.1097/RCT.0000000000000699

Objectives The objective of this study was to evaluate image quality of low dose in noncontrast paranasal sinus computed tomography (CT) using single volumetric 320-row multidetector CT technique.

Methods The low-dose protocol including tube voltage of 135 kV and tube current of 5 mAs was chosen based on results of the present phantom study. Forty-six patients were assigned to control group with factory standard settings (120 kVp, 75 mAs), and 46 patients were assigned to study group and underwent noncontrast CT of paranasal sinus with low-dose protocol using single volumetric 320-row multidetector CT device. Objective and subjective image qualities were performed.

Results Effective radiation dose calculated for control group scans was 0.45 (SD, 0.39) mSv. It was 0.038 (SD, 0.004) mSv for study group scans. The effective radiation dose of study group was statistically significant lower than control group (P < 0.001).

Conclusions Noncontrast paranasal sinus CT imaging can be performed at very low radiation exposure maintaining high image quality with 135 kVp and 5 mAs.

From the *Department of Radiology, Medical Faculty, Ataturk University; and

Department of Otorhinolaryngology, Medical Faculty, Ataturk University, Erzurum, Turkey.

Received for publication July 31, 2017; accepted October 16, 2017.

Correspondence to: Berhan Pirimoglu, MD, Department of Radiology, Faculty of Medicine Ataturk University, 25040 Erzurum, Turkey (e-mail:

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The authors declare no conflict of interest.

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