Final answer:
Time interval difference imaging is the digital fluoroscopic study that continuously changes masks to indicate variations in contrast media within structures. It, along with CT and SPECT scanning, are examples of medical imaging techniques offering 3D images and detailed views of internal body structures for diagnostic purposes.
Step-by-step explanation:
The digital fluoroscopic study that changes masks continuously, giving information on changes in contrast media content in a structure, is known as time interval difference imaging. This method is one of several advanced medical imaging techniques used for diagnostic purposes.
Computed Tomography (CT) or CAT scanners are sophisticated medical imaging devices that provide detailed images of body sections by taking 'slices' or cross-sectional pictures using X-rays. Different slices are processed and analyzed to produce three-dimensional images, which offer more information than the conventional two-dimensional X-rays. This technique has proven invaluable for seeing within the body without the obstruction of overlapping structures.
Another imaging technique, Single-Photon-Emission Computed Tomography (SPECT), also generates three-dimensional images but uses nuclear activity within the patient. SPECT has good contrast capabilities despite its lower spatial resolution compared to CT scanning.