Effective radiation dose of a MSCT, two CBCT and one conventional radiography device in the ankle region.

Juha Koivisto,Jan Wolff,Xie-Qi Shi,Nils Kadesjö,Timo Kiljunen

doi:10.1186/s13047-015-0067-8

Abstract

BackgroundThe aim of this study was to assess and compare the effective doses (ICRP 103) in the ankle region of X-ray imaging resulting from a multi slice computed tomography (MSCT) device, two cone beam CT (CBCT) devices and one conventional x-ray device.MethodsOrgan dose measurements were performed using 20 metal oxide field effect transistor (MOSFET) dosimeters that were placed in a custom made anthropomorphic RANDO ankle phantom. The following scanners were assessed in this study: Siemens Sensation Open 24-slice MSCT-scanner (120 kVp, 54 mAs), NewTom 5G CBCT scanner (110 kVp, 2.3 - 59 mAs), Planmed Verity CBCT-scanner (90 kVp, 48 mAs), Shimadzu FH-21 HR direct radiography equipment (AP + LAT), (57 kVp, 16 mAs).ResultsMeasurements of the MSCT device resulted in 21.4 μSv effective dose. The effective doses of CBCTs were between 1.9 μSv and 14.3 μSv for NewTom 5G and 6.0 μSv for Planmed Verity. Effective doses for the Shimadzu FH-21 HR conventional radiography were 1.0 μSv (LAT) and 0.5 μSv (AP), respectively.ConclusionsCompared with a conventional 2D radiographic device, this study showed a 14-fold effective dose for standard MSCT and 1.3 -10 fold effective dose for standard CBCT protocols. CBCT devices offers a 3D view of ankle imaging and exhibited lower effective doses compared with MSCT.

Highlights

The aim of this study was to assess and compare the effective doses (ICRP 103) in the ankle region of X-ray imaging resulting from a multi slice computed tomography (MSCT) device, two cone beam CT (CBCT) devices and one conventional x-ray device
X-ray devices Effective doses were calculated form organ doses obtained on one MSCT device, two CBCT devices and one conventional radiographic device: Siemens Sensation Open 24-slice scanner (Siemens, Forchheim, Germany), Planmed Verity CBCT-scanner (Figure 1A) (Planmed Oy, Helsinki, Finland), NewTom 5G CBCT scanner (Figure 1B) (NewTom 5G®, QR, Verona, Italy) and Shimadzu FH-21 HR direct digital radiography equipment (Shimadzu Corporation, Kyoto, Japan)
In this study, the organ and effective doses in the ankle area were evaluated on one MSCT device, two CBCT devices and one radiographic device

Summary

Introduction

The aim of this study was to assess and compare the effective doses (ICRP 103) in the ankle region of X-ray imaging resulting from a multi slice computed tomography (MSCT) device, two cone beam CT (CBCT) devices and one conventional x-ray device. Fractures of the foot are very common and account for approximately 10% of all fractures inflicted on the body [1]. Common causes of fractures of the foot are falling from heights and vehicle accidents [2]. The most commonly fractured foot bone is the calcaneus and accounts for approximately 60% of all foot fractures [3]. Talus fractures are the second most common fractures in the foot area and occur in 3-6% of cases [4]. Conventional radiographs have played a key role in the primary assessment of such fractures and provide quick, cheap and low-dose images. In complex fracture cases, conventional radiographs have limitations in their dynamic range and image contrast.

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