Monthly Archives: March 2009

Rectifier and Rectification in X-ray Imaging System

Hariette A.W.

Vacuum tube rectifiers – components of older x-ray imaging system that conducts electrons in only one direction, from cathode to anode. Solid-state Rectifier – components of modern x-ray imaging systems made of silicon. Unrectified voltage – voltage waveform supplied to the primary side of the high-voltage transformer. Half-wave rectification – the voltage is not allowed to swing negatively during the negative half of its cycle. Full-wave rectification – a circuit that rectifies the entire AC waveform. The exposure time for any given technique is cut in half. Take note that the target inside the x-ray tube, in the anode, specifically, Click Here To Read More

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Identifying The Causes of Film Artifacts

Hariette A.W.

TWO CLASSIFICATIONS OF ARTIFACTS Sensitized artifacts: • Artifacts result from any type of exposure that sensitizes the emulsion/ • Static electricity, pressure, extraneous radiation. Non-sensitized artifacts: • Artifacts result from physical damage to the film. • Dirt deposits, scratches. GENERAL RADIOGRAPHIC TIME PERIOD IN WHICH ARTIFACTS OCCUR 1. During radiographic exposure. 2. During processing of the film. 3. When the film is being handled and stores either before or after processing. EXPOSURE ARTIFACTS • Associated with the manner in which the radiographer conducts the examination. • Incorrect screen-film match. • Poor screen-film contact. • Warped cassette. • Improper positioning of Click Here To Read More

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Nuclear Medicine Terms You Might Want To Know

Hariette A.W.

Nuclear Medicine is a specialized area of the Radiologic Technology Field; in order to better grasp the value of this area, there are terms that must be fully understood first and they are listed below:  Bone scans is use to detect diseases of the bone at the earliest possible time. It is often more sensitive than X-rays in diagnosing infections, tumors, and fractures.  Calibration is the act of checking or adjusting (by comparison with a standard) the accuracy of a measuring instrument.  Dose calibrator (radioisotope calibrator) is a device used in radiological research that measures the total Click Here To Read More

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