Ziehm Imaging, Inc. VISION, Руководство по установке

Страница: 35 / 55

Ziehm Imaging, Inc. Vision Installation Manual MAN 06-0015, Rev. A Page 22
M a i n t e n a n c e R e p o r t : M a x i m u m D o s e R a t e
Maximum Dose
Rate
Federal Regulations
Federal regulations (21 CFR 1020.32 (d) (1)) establish that fluoroscopic equipment
with automatic dose rate control shall not be operable at any combination of tube
potential and current which will result in an exposure rate in excess of 10 roentgens-
per-minute at the point where the center of the useful beam enters the patient.
1. Position a dosimeter probe as shown in Figure 10.
Fig. 10 .Set-up of Maximum Dose Rate Test
2. Select full image intensifier format.
3. Fully open the collimator.
4. Cover the image intensifier input with 3 mm of lead blocker.
5. Select Extremities and initiate fluoroscopy with the foot switch. Write the result-
ing dose rate in the box below.
6. Select Pelvic and initiate fluoroscopy with the foot switch. Write the resulting
dose rate in the box below.
7. Select Thoracic and initiate fluoroscopy with the foot switch. Write the resulting
dose rate in the box below..
Reject if entrance dose rate is greater than 9.9 R/min.
Extremities Entrance dose rate = _______________ R/min
Pelvic Entrance dose rate = _______________ R/min
Thoracic Entrance dose rate = _______________ R/min