Answer to Question #10527 Submitted to "Ask the Experts"
The following question was answered by an expert in the appropriate field:
1. Chest two-view PA/LAT0 — 0.6 mSv
2. Lumbar spine complete, five views — 1.8 mSv
I am unsure of the radiation dose from the following two procedures. I believe the dose for the cervical spine series on your website is for three views; however, as indicated below, I had six views taken. And I did not find information on the right rib series.
3. Cervical spine series, six views
4. Right rib series, five views
Could you please tell me if my calculations for numbers 1 and 2 are correct and in addition let me know what the approximate dose for numbers 3 and 4 would be?
The exposure from the chest PA (posterior-anterior) and LAT (lateral) views is 0.06 mSv, not 0.6 mSv. The lumbar spine series dose is correct at 1.8 mSv.
I could not find any reference to a six-view cervical spine series. The typical three-view series includes an AP, LAT and open-mouth views. Since the area being exposed would be about the same for an additional three views, it is reasonable to estimate the exposure as twice the normal cervical series. This would be about 0.5 mSv.
The right rib series is also complicated because doses from this procedure are not reported in the scientific literature. An estimate of 0.6 mSv was calculated by taking the doses from standard chest PA and lateral radiographs and adjusting the dose to account for differences in the x-ray machine settings. Chest radiographs were used as a starting point because the same internal organs are exposed.
Your total dose from these procedures is estimated to be about 3 mSv.
Kent Lambert, CHP