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ePub Performance specifications and acceptance testing for X-ray generators and automatic exposure control devices: report of the Diagnostic X-ray Imaging ... and Automatic Exposure Control Devices download

ePub Performance specifications and acceptance testing for X-ray generators and automatic exposure control devices: report of the Diagnostic X-ray Imaging ... and Automatic Exposure Control Devices download
ISBN13:
978-0883184615
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0883184613
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American Institute of Physics; 1998 edition (March 31, 1998)
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x-ray generators a n d automatic exposure control devices. To execute this charge a task group was formed in November of 1981.

x-ray generators a n d automatic exposure control devices. This report reflects the collective efforts of the task group to provide a document which would be useful to practicing medical physicists who might be called upon to assist i n the development of bid documents and the evaluation of performance specifications and acceptance testing o f these components of radiological imaging systems. This report is divided into three parts relating to x-ray generators and automatic exposure control devices.

Diagnostic X-Ray Imaging Committee of the American Association of Physicists in Medicine to develop a document addressing performance specifications and acceptance testing methods for x-ray generators a n d automatic exposure control devices.

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Report No. 014 - Performance Specifications and Acceptance Testing for . The first part contains background information concerning the principles of operation of x-ray generators and automatic exposure control devices. 014 - Performance Specifications and Acceptance Testing for X-Ray Generators and Automatic Exposure Control Devices (1985). The second part identifies relevant characteristics of x-ray generators and automatic exposure control devices for which performance specifications would be useful vendor to assist in evaluating different types of equipment.

Automatic Exposure Control (AEC) is an X-ray exposure termination device

Automatic Exposure Control (AEC) is an X-ray exposure termination device. A medical radiography x-ray exposure is always initiated by a human operator but an AEC detector system may be used to terminate the exposure when a predetermined amount of radiation has been received. The intention of AEC is to provide consistent x-ray image exposure, whether to film, a digital detector or a CT scanner. AEC systems may also automatically set exposure factors such as the X-ray tube current and voltage.

Automatic exposure controls (AECs) used with computed radiography (CR) equipment need to be set for a constant signal level in the resultant images. The response varies with the energy of the X-ray beam in a different way from conventional film screen combinations. However, other parameters could potentially be applied.

The automatic exposure control devices of contemporary x-ray generators have a constant lead time which accurately takes into .

Two major limitations of the exposure control system are described that prevent itsmore being completely automatic in function: it mnust be individually calibrated with the predetermined light response of the phototube, the filmemulsion speed, the framing rate, the camera aperture, and the processing method; and no mechanical or electrical compensating device is provided to adjust the sensitivity of the phototube to the varying.

Report this Document. Description: A Quality Control Test for General X-Ray Machine. X-Rays are produced when the electrons are suddenly decelerated upon collision with the metal target; these X-Rays are commonly called brehmsstrahlung or "braking radiation".

Automatic Exposure Control (AEC) is an X-ray exposure termination device. An medical radiographic x-ray exposure is always initiated by an x-ray technician. Next, the x-ray termination can be performed either by the x-ray technician or an exposure control device such as an phototimer or ion chamber detectors, which ever comes first. The purpose of AEC is to deliver consistent, reproducible exposures across a wide range of anatomical thicknesses, kVp, and users.

Diagnostic Devices Branch Division of Enforcement I Office of Compliance 2098 .

Diagnostic Devices Branch Division of Enforcement I Office of Compliance 2098 Gaither Road Rockville, Maryland 20850. The manual provides information on each of the performance requirements that are evaluated under the "Routine Compliance Testing for Diagnostic X-Ray Systems" program. X-ray beams with high penetrability are termed high quality, or "hard" beams, while those with low penetrability are of low quality and are called "soft" beams. In radiology, the quality of x-rays is characterized numerically by half-value layer (HVL).