17.DSA ,based on flat panel detector, not only has the advantage of good image resolution, but also decreases the radiation dose received by patients and physicians.

41.You need to remain perfectly still during the time the imaging take place.

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

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.

11.In the X-ray imaging device,detector and data acquisition unit of X-ray imaging device transform X-ray ,passing through human body,into electrical signal.

49.DICOM enables the integration of scanners, servers, workstations, printers and network hardware from multiple manufacturers into a picture archiving and communication system PACS.

19.Therefor ,like the conventional X-ray images , the shadow indicates low absorption area , namely the low density area such as lungs ; and the bright indicates the high absorption area, namely the high density area ,such as bone.

7.The conditions include body size,tube voltage,tube current,exposure time,pitch,reconstruction algorithm,and so on.

44.At the present time, the eriphasis of nuclear medicine studies is more on its function and
chemistry than anatomic structure.

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