倒转
发表于 2025-3-23 12:55:35
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小步走路
发表于 2025-3-23 16:22:23
Construction and Operation of the X-ray Tube,Before discussing X-ray tubes as employed in modern diagnostic and therapeutic techniques, it will be informative to consider briefly the tubes originally used to generate X-radiation, known as gas (or ion) tubes.
chassis
发表于 2025-3-23 20:03:45
Properties of X-rays,X-rays propagate in straight lines and are very difficult to deflect from their direction. X-rays cannot be concentrated or reflected by lenses or mirrors.
GET
发表于 2025-3-23 22:48:58
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Clumsy
发表于 2025-3-24 05:23:35
Definition (Sharpness),As sharpness is an abstract idea that cannot be expressed in measure or number and can moreover never be realized in practice, we prefer to speak about the lack of definition or unsharpness.
debunk
发表于 2025-3-24 09:51:14
Contrast,Contrast, a concept already introduced in chapters III and V, is as important to an X-ray film as sharpness.
FLUSH
发表于 2025-3-24 11:51:56
Special Exposure Techniques,During recent years many refinements in exposure technique have been realized. A brief discussion will follow in this chapter.
欲望
发表于 2025-3-24 18:46:24
Radiographic Technique in General,The radiographic views obtained as a result of the directions in which the X-ray beam passes through the body for different exposures are designated by Latin expressions and abbreviations. The most common views, or projections, are depicted in fig. 14.1.
Paleontology
发表于 2025-3-24 22:53:17
The Biological Effect of Radiation and Methods of Irradation,The aim of radiotherapy is to beneficially influence morbid processes in the body by means of irradiation. This is possible because of the biological effect of X-rays on the living cell.
DUCE
发表于 2025-3-24 23:42:19
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