43.PET is a noninvasive nuclear imaging technique that involves the administration of positron-emitting radioactive molecule and kinetics of the radioactive material as it moves
into and out of tissues.

9.Although there are great differences among diagnostic X-ray machines for different diagnostic objectives,the fundamental structure of X-ray machines is similar ,which consists of X-ray generating device,X-ray imaging device and X-ray auxiliary device.

28.To tilt the gantry forward(+) or backward(-),press the respective buttons on the gantry panel.The tilt range is from -30 to +30 degrees .Zero(0) indicate that the gantry is in the vertical position.

36.Surface coils are used as detectors and body coil as the transmitter.

18.Automatic control of X-ray tube current is realized by adjusting primary voltage of X-ray tube filament transformer to obtain stable and high quality image.

6.The diagnosis doctors would make sure the exam plan according to the medical history,and the nurse would confirm that the patient do not have contrast medium allergy on the basis of drug allergy history.

38.A gadolinium-based contrast agent does not contain iodine and ,therefore ,rarely causes an allergic reaction.

34.Resistive magnets have conventional thick copper windings and generate a great deal of heat.

31.Magnetic fields can be produced either by electromagnets or by permanent magnets .

2.Many diseases in clinical departments are required to achieve the definite diagnosis by the exam of radiology equipment.