jApparatus Engineering of X ray CT Equipment(9) : Dose Evaluation(Basic Lectures-CT)

Radiation Dose in X-Ray and CT Exams

What are x-rays and what do they do? X-rays are forms of radiant energy, like light or radio waves. Unlike light, x-rays can penetrate the body, which allows a radiologist to produce pictures of internal structures. The radiologist can view these on photographic film or on a TV or computer monitor. X-ray examinations provide valuable information about your health and play an important role in h...

Radiation Dose in X-Ray and CT Exams

People living in the plateaus of Colorado or New Mexico receive about 1.5 mSv more per year than those living near sea level. The added dose from cosmic rays during a coast-to-coast round trip flight in a commercial airplane is about 0.03 mSv. Altitude plays a big role, but the largest source of background radiation comes from radon gas in our homes (about 2 mSv per year). Like other sources of...

Assessment of CT dose in X-ray CT polyacrylamide gel dosimetry

Comparing X-ray dose reduction capability of silicon-bismuth micro- and nanocomposite shields using chest CT test

Comparison of radiation shields of different thicknesses and structures (especially different particle sizes of their constituents) is helpful to select an appropriate shield for patient protection in medical imaging tests particularly CT-scan. In this study micro- and nano-powders of bismuth were mixed with silicone matrix to make composite radiation shields for breast. The shields were provid...

Artifacts in X-ray CT