What is the radiation limit for patients?
The maximum permissible dose (MPD) is the upper limit of allowed radiation dose that one may receive without the risk of significant side effects.
The annual whole-body dose limit for physicians is 50 mSv.
Table 77.4 shows the annual maximum permissible dose per target area.How much radiation is in radiology?
A single chest x-ray exposes the patient to about 0.1 mSv.
This is about the same amount of radiation people are exposed to naturally over the course of about 10 days.
A mammogram exposes a woman to 0.4 mSv, or about the amount a person would expect to get from natural background exposure over 7 weeks.What type of radiation is used in diagnostic radiology?
X-rays are a form of electromagnetic radiation, similar to visible light.
Unlike light, however, x-rays have higher energy and can pass through most objects, including the body.
Medical x-rays are used to generate images of tissues and structures inside the body.- Calculation of external exposure doses is based not on the radioactivity intensity (becquerels) but on the amount of radiation (grays or sieverts) the human body is exposed to.
If the dose rate is constant, the total exposure dose can be calculated by multiplying the dose rate by the time of exposure to radiation.
Revised radiation doses for typical X-ray examinations
Doses to Patients from Radiographic and Fluoroscopic X-ray
CHAPTER 4 DATA WAREHOUSING
Chapter-6 data warehouse introduction
Introduction to Data Warehousing
An Overview of Data Warehousing and OLAP Technology
Data Warehouse and OLAP Technology: An Overview
Data Warehousing and OLAP Technology
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