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Positioning of the x-ray camera: The x-ray video camera sits above the patient's chest, while the x-ray beam is delivered from underneath the table. A movie camera is attached to the tube to record images on a 35 mm film, while a cineless lab will forego the movie camera and record the angiogram on a computer storage drive. Images are also noted "live" on the monitor and recorded segments can be reviewed and digitally analyzed (catheter dimension, vessel size, lesion length, ejection fraction, etc.) and manipulated (slow motion, zoom, etc).
   The x-ray tube is rotated around the patient (side-to-side, and also towards and away from the head), as shown below. By taking pictures from different angles, the cardiologist can inspect a stenotic lesion from several points of view. This increases the accuracy of assessing the clinical importance and severity of a blockage. It also helps determine the patients candidacy for angioplasty, stinting, surgery, medical treatment, etc. and in the selection of the device and its diameter and length (in the case of a stent).

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  Cardiac Catheterization is usually carried out in a hospital setting but may also be performed in some clinics or in a mobile laboratory. The patient lays on a table with an attached handle or control. The controller allows the cardiologist to move the table and to also rotate the x-ray tube. A radiation shield is present between the cardiologist and patient to cut down on exposure to radiation scatter. The top portion of the shield is transparent so that the operator can see the patient through it.
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