Читать книгу A Comprehensive Guide to Radiographic Sciences and Technology - Euclid Seeram - Страница 33

Digital radiographic imaging systems generally referred to as DR has replaced the workhorse of diagnostic radiography, FSR. DR is defined by the American Association of Physicists in Medicine (AAPM) [4] as “radiographic imaging technology producing digital projection images such as those using photostimulable storage phosphor (computed radiography or CR), amorphous selenium, amorphous silicon, charge‐coupled device (CCD), and metal oxide semiconductor‐field effect transistor (MOSFET) technology.” DR includes computed radiography (CR) and flat‐panel digital radiography (FPDR); digital fluoroscopy (DF); digital mammography (DM); digital radiographic tomosynthesis (DRT) and digital breast tomosynthesis (DBT); and CT. These modalities are described in detail by Seeram [5].

The overall major system components of any DR modality are illustrated in Figure 2.4, and includes an x‐ray generator, an x‐ray tube, a digital detector, a computer, an image display monitor, and finally a digital communications system.

1 The x‐ray generator provides the electrical power to the x‐ray tube to provide the appropriate radiation exposure for the examination under investigation.

2 The patient is exposed and a latent image is created on the digital detector.

3 The latent image is processed by the computer and subsequently displayed on a monitor for viewing and interpretation.

4 The image can be stored and communicated to remote sites for viewing.

Each of the DR modalities listed above will be reviewed below with respect to major imaging system components only. The details of each of these modalities work will be described in later chapters.

Figure 2.4 The overall major system components of any DR modality includes an x‐ray generator, an x‐ray tube, a digital detector, a computer, an image display monitor, and finally a digital communications system.