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Patient dose evaluation for the whole-body low-dose multidetector CT (WBLDMDCT) skeleton study in multiple myeloma
Fabiola Cretti1, Giovanna Perugini2
1USC Fisica Sanitaria, Imaging Department, Azienda Ospedaliera Papa Giovanni XXIII, Piazza OMS 1, 24100, Bergamo, Italy. fabiolacretti@gmail.com.
Objective:
This study aimed at estimating the patient effective dose during whole-body low-dose multi detector computed tomography with a scanner Philips Brillance 64, and to compare it with those reported in literature for the same procedure and with the dose of the conventional X-ray examination in our institution.
Materials And Methods:
WBLDMDCT effective dose was evaluated for 29 MM patients, using Dose Length Product values. Conventional X-ray examination dose was estimated using a Rando Phantom and Dose Area Product indexes. ICRP Publication 103 based coefficients were used.
Results:
Mean WBLDMDCT effective dose values-estimated using sex-specific conversion coefficients and body weight factors-were 3.6 and 2.8 mSv for females and males, respectively. The effective dose for the conventional method was 1.2 mSv for Rando phantom.
Conclusion:
The WBLDMDCT effective dose in our institution is consistent with the values reported in previous studies. Such a dose is about 2.5- to 3-fold higher than the mean radiation dose of the conventional X-ray study. Nevertheless, considering the improved diagnostic accuracy of the CT investigation, the comfort of the patient and the old age of the MM population, dose/quality ratio can be considered favourable.
