The cause for my concern is that a CT scan has so high a radiation dose
and most physicians are not aware of this high dose that it delivers as
shown by numerous studies.

[1] This study from Yale University shows that physicians and patients
are not fully aware of the radiation dose and the risk associated with
CT scanning.

[2] "a typical CT scan of the chest gives a radiation dose equivalent
to 400 chest radiographs (chest CT » 8 mSv, chest radiography = 0.02
mSv) and a high resolution CT scan of chest by conventional scanner
(thin slices, high mA) gives a dose of more than 600 chest radiographs"

[1]Source: Lee CI, Haims AH, Monico EP, et al. Diagnostic CT scans:
assessment of patient, physician, and radiologist awareness of
radiation dose and possible risks. Radiology. 2004;231:393-398.

[2]Source: The Royal College of Radiologists. Making the best use of
department of clinical radiology- guidelines for doctors, Fourth
edition. London: The Royal College of Radiologists, 1998