删减
发表于 2025-3-26 22:09:11
Organ (anatomatically) programmed units, automatic film changers and other specialized X-ray equipminexperienced staff or by radiographers who are not familiar with the equipment, as for example when staff operate on a rota basis and do not spend very long in any one room. The use of automatic exposure control goes some way towards overcoming this problem but an extension of this concept in terms
讨好女人
发表于 2025-3-27 04:26:20
http://reply.papertrans.cn/32/3136/313505/313505_32.png
Herd-Immunity
发表于 2025-3-27 07:52:20
http://reply.papertrans.cn/32/3136/313505/313505_33.png
MIRTH
发表于 2025-3-27 10:32:44
http://reply.papertrans.cn/32/3136/313505/313505_34.png
使迷醉
发表于 2025-3-27 16:44:16
Basic Concepts of Linear Optical System,ronic’ means the control of electron motion in a circuit by means of thermionic valves (or solid state devices). Until recently thermionic diode valves were used for high tension rectification and thermionic triode valves (thyratrons) for primary switching. However, these devices are now rarely, if
肥料
发表于 2025-3-27 20:41:41
The Bitter End of Politicized Promotions,s the length of time for which the switching device is closed is one of the factors which determines film blackening, some means of accurately measuring and reproducing the time of exposure is essential. One or other of a number of different types of timer may be used for this purpose, the simplest
内疚
发表于 2025-3-28 00:01:10
Applied Scanning Probe Methods IIIatter. The processed radiograph is a pattern of densities forming a shadow image of the structures penetrated by the radiation. The extent to which the radiation is absorbed is determined by the atomic number of the tissues encountered. Bone, for example (atomic number 14), absorbs more radiation th
Root494
发表于 2025-3-28 02:23:35
Joseph M. Kinsella,Albena Ivanisevicr such as cadmium zinc sulphide coated onto thin card is sandwiched between a piece of protective plastic on the patient’s side and a sheet of lead glass on the observer’s side (Figure 8.1). This sandwich is mounted in a metal framework which gives support to the screen and provides a means of attac
黄油没有
发表于 2025-3-28 07:29:10
Alexander M. Gigler,Othmar Martich equipment is particularly useful for domiciliary radiography or when X-ray equipment needs to be transported from hospital to hospital to take the occasional radiograph. Whilst its principal advantage is mobility its main disadvantages are lack of power, lack of stability and lack of precision.
nerve-sparing
发表于 2025-3-28 11:19:24
http://reply.papertrans.cn/32/3136/313505/313505_40.png