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Proceedings Paper

Dedicated dental volumetric and total body multislice computed tomography: a comparison of image quality and radiation dose
Author(s): Sabina Strocchi; Vittoria Colli; Raffaele Novario; Gianpaolo Carrafiello; Andrea Giorgianni; Aldo Macchi; Carlo Fugazzola; Leopoldo Conte
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Paper Abstract

Aim of this work is to compare the performances of a Xoran Technologies i-CAT Cone Beam CT for dental applications with those of a standard total body multislice CT (Toshiba Aquilion 64 multislice) used for dental examinations. Image quality and doses to patients have been compared for the three main i-CAT protocols, the Toshiba standard protocol and a Toshiba modified protocol. Images of two phantoms have been acquired: a standard CT quality control phantom and an Alderson Rando® anthropomorphic phantom. Image noise, Signal to Noise Ratio (SNR), Contrast to Noise Ratio (CNR) and geometric accuracy have been considered. Clinical image quality was assessed. Effective dose and doses to main head and neck organs were evaluated by means of thermo-luminescent dosimeters (TLD-100) placed in the anthropomorphic phantom. A Quality Index (QI), defined as the ratio of squared CNR to effective dose, has been evaluated. The evaluated effective doses range from 0.06 mSv (i-CAT 10 s protocol) to 2.37 mSv (Toshiba standard protocol). The Toshiba modified protocol (halved tube current, higher pitch value) imparts lower effective dose (0.99 mSv). The conventional CT device provides lower image noise and better SNR, but clinical effectiveness similar to that of dedicated dental CT (comparable CNR and clinical judgment). Consequently, QI values are much higher for this second CT scanner. No geometric distortion has been observed with both devices. As a conclusion, dental volumetric CT supplies adequate image quality to clinical purposes, at doses that are really lower than those imparted by a conventional CT device.

Paper Details

Date Published: 16 March 2007
PDF: 8 pages
Proc. SPIE 6510, Medical Imaging 2007: Physics of Medical Imaging, 65102I (16 March 2007); doi: 10.1117/12.708431
Show Author Affiliations
Sabina Strocchi, Univ. Hospital of Insubria (Italy)
Vittoria Colli, Univ. Hospital of Insubria (Italy)
Raffaele Novario, Univ. of Insubria (Italy)
Gianpaolo Carrafiello, Univ. of Insubria (Italy)
Andrea Giorgianni, Univ. Hospital of Insubria (Italy)
Aldo Macchi, Univ. of Insubria (Italy)
Carlo Fugazzola, Univ. of Insubria (Italy)
Leopoldo Conte, Univ. of Insubria (Italy)

Published in SPIE Proceedings Vol. 6510:
Medical Imaging 2007: Physics of Medical Imaging
Jiang Hsieh; Michael J. Flynn, Editor(s)

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