(1) Normal plane imaging: ① Anterior position, the left and right sides of the skull image are basically symmetrical, and the radioactive enhancement area around the skull is composed of the radioactivity of scalp, skull plate and temporal muscle, with the upper sagittal sinus shadow in the center of the top and the radioactive concentration area in the infraorbital cheek. Both hemispheres are elliptical radioactive blank areas. ② On the lateral position, the middle blank area of the radioactive enhancement shadow between the top of the head and the skull base is the cerebral hemisphere, and there is a slight radioactive enhancement band extending from the occipital part to the petrous part of the temporal bone, which is the image of sigmoid sinus and transverse sinus, with the cerebral hemisphere above and the cerebellar hemisphere below. ③ The figure in the posterior position is basically similar to that in the anterior position, except that the occipital sinus confluence image and the transverse sinus image extending from left to right can be seen in the middle and lower part of the middle blank area, with the cerebral hemisphere above and the cerebellar hemisphere below. ④ Top position, oval, with upper sagittal sinus shadow in the middle, nose and mouth image at the front end and sinus confluence at the back end. The dense shadows between the left and right sides of the periphery are temporal muscle and parotid gland.

(2) Normal tomography: Except the images of increased radioactivity around the brain, there are blank areas in both hemispheres of the brain.

(3) Abnormal imaging: Any abnormal imaging agent concentrated in the above-mentioned normal blank area is regarded as abnormal.