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2017 ; 18
(5
): 364-368
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Technical note: No increase in effective dose from half compared to full rotation
pelvis cone beam CT
#MMPMID28766828
Hauri P
; Hälg RA
; Schneider U
J Appl Clin Med Phys
2017[Sep]; 18
(5
): 364-368
PMID28766828
show ga
PURPOSE: To image the abdomen of a patient with a gantry mounted imaging system
of a linear accelerator, different cone beam computed tomography (CBCT) protocols
are available. The whole-body dose of a full rotation abdomen CBCT and a half
rotation CBCT was compared. In our clinic, both CBCT protocols are used in daily
routine work. METHODS: With an adult anthropomorphic Alderson phantom, the
whole-body dose per CBCT scan was measured with thermoluminescence dosimeters.
The half rotation CBCT was applied such that the gantry mounted X-ray source
rotated around the right side of the phantom. The 183 measurement locations
covered all ICRP recommended critical organs (except the gonads). The effective
dose was calculated with the mean organ dose and the corresponding tissue
weighting factors. A point-by-point dose comparison of both protocols was
conducted. RESULTS: The effective dose was 5.4 mSv ±5% and 5.0 mSv ±5% (estimated
type B 1?) for the full and the half rotation CBCT respectively. There was no
significant difference (? = 0.05) in the effective dose within the precision of
the measurement (1? = 5%). The half rotation CBCT displayed an inhomogeneous dose
distribution in a transversal phantom slice in contrast with the full rotation
CBCT. In the imaging region, the mean dose was (20.5 ± 3.4) mGy and
(19.2 ± 7.4) mGy (measured type A 1?) for the full and the half rotation CBCT
respectively. CONCLUSION: The half compared to the full rotation CBCT displays a
smaller field-of-view in a transversal slice and no significant difference in the
effective dose. Hence, the full rotation CBCT is favorable compared to the half
rotation CBCT. However, by using the half rotation protocol, critical volumes in
the patient can be spared compared to the full rotation protocol.
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