Assessment of effective radiation dose of an extremity CBCT, MSCT and conventional X ray for knee area using MOSFET dosemeters

作者：Koivisto Juha^*; Kiljunen Timo; Wolff Jan; Kortesniemi Mika

来源：Radiation Protection Dosimetry, 2013, 157(4): 515-524.

DOI：10.1093/rpd/nct162

The objective of this study was to assess and compare the organ and effective doses in the knee area resulting from different commercially available multislice computed tomography devices (MSCT), one cone beam computed tomography device (CBCT) and one conventional X-ray radiography device using MOSFET dosemeters and an anthropomorphic RANDO knee phantom. Measurements of the MSCT devices resulted in effective doses ranging between 27 and 48 Sv. The CBCT measurements resulted in an effective dose of 12.6 Sv. The effective doses attained using the conventional radiography device were 1.8 Sv for lateral and 1.2 Sv for anteriorposterior projections. The effective dose resulting from conventional radiography was considerably lower than those recorded for the CBCT and MSCT devices. The MSCT effective dose results were two to four times higher than those measured on the CBCT device. This study demonstrates that CBCT can be regarded as a potential low-dose 3D imaging technique for knee examinations.