AUTOTOMOGRAPHY

1. The principles of autotomography are reviewed geometrically and experimentally.

2. Autotomography with a stationary roentgenographic plate is geometrically incorrect.

3. With this modality only the axis of rotation shows lack of blurring.

4. With small angles, autotomography yields excellent and sharp images indistinguishable from those of true tomography.

5. Classical autotomography, therefore, remains a very useful technique in pneumoencephalography.

6. True autotomography can be achieved by rotating the object and the roentgenographic plate.

7. This modality has the advantages of preventing vibration of the roentgen-ray tube. Therefore, magnification tomography can be achieved.

Excellent images were obtained with a new true pluridirectional autotomograph. Its application for clinical use has to be restricted to small angles (up to 15°) because of possible organ shift during rotation of the patient.

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