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P 73<br />
Title<br />
CONE bEAM COMPuTED TOMOGRAPHy IMAGE QuALITy- A COMPARISON OF 3 uNITS.<br />
Authors<br />
C. GREENALL 1 , b. THOMAS 2 , N. DRAGE 3 , J. bROWN 4<br />
Affiliations<br />
1 Department of Dental Radiology, University Dental Hospital, Cardiff, UNITED KINGDOM, 2 KCL<br />
Dental Institute of Guys, Kings College and St Thom<strong>as</strong> Hospital, London, UNITED KINGDOM, 3<br />
Department of Dental Radiology, University Dental Hospital, Cardiff, UNITED KINGDOM, 4 KCL<br />
Dental Institute of Guys, Kings College and St Thom<strong>as</strong> Hospital, London, UNITED KINGDOM<br />
Body<br />
Objectives: To <strong>as</strong>sess the quality of cone beam computed tomography (CBCT) images taken on<br />
three different CBCT units, and to determine the main causes of error.<br />
Method: The image quality of all CBCT scans taken during 2010 on the i-CAT Cl<strong>as</strong>sic, the Next<br />
Generation i-CAT and the Accuitomo 3D FDP w<strong>as</strong> rated using the 2 point rating scale recommended<br />
by the Health Protection Agency (HPA) (UK). The images were graded either acceptable<br />
or unacceptable. The re<strong>as</strong>on for any unacceptable image w<strong>as</strong> recorded and the overall<br />
rejection rate calculated for each unit and compared to the standard set by HPA.<br />
Results: A total of 1066 CBCT scans were <strong>as</strong>sessed. The overall rejection rate w<strong>as</strong> 3.4%. The<br />
rejection rate w<strong>as</strong> 4.2% (15/361) for the i-CAT Cl<strong>as</strong>sic, 6.4% (7/109) for the Next Generation<br />
i-CAT and 2.3% (14/596) for the Accuitomo 3D FDP. For the i-CAT cl<strong>as</strong>sic the most common<br />
re<strong>as</strong>on for rejection w<strong>as</strong> blurring of the image due to patient movement (86.7%). For the Next<br />
Generation i-CAT and Accuitomo 3D FDP, it w<strong>as</strong> failure to image the complete area of interest<br />
(85.7 and 57.1% respectively.)<br />
Conclusions: Overall the reject rate w<strong>as</strong> below the recommended standard of 5%. However the<br />
reject rate for the Next Generation did not reach the standard. Particular care h<strong>as</strong> to be taken<br />
to ensure the patient is immobilised correctly when undertaking CBCT using the i-CAT CBCT<br />
units. For both the Next Generation i-CAT and Accuitomo 3D FDP careful positioning is required<br />
to ensure the region of interest is completely captured in the scan volume.<br />
Keywords<br />
Cone Beam Computed-Tomography,Quality Assurance, Healthcare<br />
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