ecently, X-ray CT (Computed Tomography) is very popular as helpful diagnostics. But its high exposure dose as compared with simple roentgenography should be assessed on a clinical basis as an input to the justification and the optimization. The IAEA has called for enhanced Radiation Protection of Patients (RPoP).
he number of CT scanners in Japan, about 13,000, has been acknowledged
to be the largest over the world, as published in the reports from the
OECD (Organization for Economic Co-operation and Development) in 2014.
And the number of CT scanners per million populations is about 92; this
is by far the largest. On the other hand, the number of CT scanners in
America is the second largest and is comparable with Japan, but it per
million populations is about 32. In Japan these situation urges the patient
dose assessment on a clinical basis as an input to the justification and
AZA-ARI is the web-based open system for CT dose calculator, which has
been developed by Oita University of Nursing and Health Sciences and the
Japan Atomic Energy Agency (JAEA) . From Dec. 2012, it has installed in
the web server of NIRS, and opened to the public for trial use. In this
version, users can select 3 phantoms (adult male and female and 4 years
old girl) for a dose calculation.
o consider patient’s age and body type, we installed the simulation data
of organ doses and effective doses for several phantoms on WAZA-ARI system.
And we added the database function of storing the calculation results in
each facility in order to check the exposure levels of the CT examination
in each medical facility in japan. We developed WAZA-ARIv2 associated with
improvement of above functions. WAZA-ARIv2 was opened to the public on Jan. 31, 2015. And corresponding homepage was made and uploaded onto the NIRS web server.
Report and Paper
- NIRS annual Report 2014-2015, pp.96-97.
8. Reserch on Evaluation of Medical Exposure
- WAZA-ARI - A web-based CT dose calculator - ,URL: http://waza-ari.nirs.qst.go.jp/
- Takahashi F, Sato K, Endo A, Ono K, Ban N, Hasegawa T, Katsunuma Y, Yoshitake
T, Kai M. Numerical Analysis of Organ Doses Delivered During Computed Tomography
Examinations Using Japanese Adult Phantoms with the WAZA-ARI Dosimetry
System. Health Phys., 109(2), 104-112, 2015.
- Ban N, Takahashi, Ono K, Hasegawa T, Yoshitake T, Katsunuma Y, Sato K, Endo A and Kai M. Development of a web-based CT dose calculator: WAZA-ARI. Radiat. Prot. Dosim., 147, 333-337, 2011.