Prism Compensating Filter
>Velcro is incorporated at each end; other self-adhesive Velcro (supplied) serves to fix the filter to the collimator or to a cassette.
>Also used next to the patient.
Benefits
- ABDOMEN, DOUBLE CONTRAST, lateral decubitus
- SOME CHESTS with a large base EXTREMITIES
- CALCANEUM, axial view
- OLECRANUM, axial view
- PATELLA and TIBIAL TUBEROSITY
Little Prism used at the Collimator
Figure 1: The Little Prism is fixed to the collimator
1. Has two gradients: one of 37, for regular filtration; the other of 52, for steeper
filtration. When placed on the collimator, the gradient is 4 times less on the film
(see p. 4). Velcro is fixed to both extremities.
2. Prepare the collimator by placing the self-adhesive Velcro around the window. If a
track is present, use one or two supplied plastic spacer(s) nearby to raise the Velcro
at the level of the track.
3. The little prism may then be fixed in any position.
4. It may also be placed next to the patient.
Figure 2: ABDOMEN, HORIZONTAL BEAM
For sagging abdomen only. Filter no more than 5 to 12 cm on the patient.
Lateral decubitus films of D.C. enemas are improved when covering the upper 10 cm of a flaccid abdomen with the shadow of the LITTLE PRISM.
The filter is also useful on chests having a wide base, to attenuate over-penetration of the apexes. Sometimes useful over the thinner part of some extremities.
