Application of Longitudinal Magnification Effect to Magnification Stereoscopic Angiography: A New Method of Cerebral Angiography

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Abstract
A new method of stereoscopic cerebral angiography was developed which employs 2.times. radiographic magnification. In order to obtain the same depth perception in the object as with conventional contact stereoscopic angiography, X-ray exposures can be made at 2 focal spot positions which are separated by only 1 in. (2.5 cm); the contact technique requires a separation of 4 in. (10 cm). The smaller distance is possible because with 2.times. magnification the transverse detail in the object is magnified by a factor of 2, but the longitudinal detail, which is related to the stereo effect, is magnified by a factor of 4, due to the longitudinal magnification effect. The small focal spot separation results in advantages such as improved stereoscopic image detail, better image quality and low radiation exposure to the patient.

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