The patient is automatically moved head first into the CT gantry, and the x-ray tomogram is acquired. Now the patient is automatically moved through the PET gantry, which is mounted in parallel with the CT gantry, and the PET slices are acquired. The patient may now leave the device, and the PET-CT software starts reconstructing and aligning the PET and CT images.
Diagnostic Procedures. Three common diagnostic procedures, tonometry, visual field tests, and ophthalmoscopy, enable ophthalmologists to screen patients for glaucoma. To make a definitive diagnosis, ophthalmologists often use all 3 procedures as part of an overall eye examination. The procedures are simple, relatively quick, and virtually painless.
The diagnosis of glaucoma is made when your eye doctor notices a particular type of damage in the optic nerve known as âcupping.â This diagnostic finding can occur with or without high intraocular pressure. A normal intraocular pressure (IOP) ranges between 12 and 22 mmHg (millimeters of mercury, a measurement of pressure).