Radiation Quality - Siemens MAMMOMAT 1000 Nova Application Handbook
Mammography applications
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Also See for MAMMOMAT 1000 Nova:
- Installation and start-up instructions manual (138 pages) ,
- Wiring diagrams (70 pages) ,
- Maintenance instructions manual (34 pages)
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IMAGE QUALITY
Radiation quality
The radiation quality is determined by the kV value, anode material
and filter.
Low kV means that the image contrast increases. The kV value to
be used is determined by each individual facility. Some film/screen
combinations are recommended to be used with a high kV (28-30)
in order to keep the contrast down.
At 25 kV and large focal spot, the tube current for a Siemens
mammography-X-ray tube with a molybdenum anode is 150 mA.
This is an important factor, since high mA gives a short exposure
time and, consequently, a reduced risk of motion artifacts.
The Siemens MAMMOMAT 3000 Nova can be configured with
an X-ray tube with two different anode materials - molybdenum
and tungsten, plus various filter combinations of molybdenum
and rhodium. At 25 kV, the tube current with tungsten (W) anode
is 188 mA. This, in combination with a rhodium filter, will provide
high energy radiation and also reduce dose to the patient.
See the section on Opdose for instructions on use of the system.
The focus size need not be selected. Fine focus will automatically
be selected when the magnification table is inserted.
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