Testing With The Phantom Pointer For Brainlab Headring - Brainlab RT/RS Hardware User's Manual

Winston-Lutz Test
6.1.1

Testing with the Phantom Pointer for Brainlab Headring

Overview
Brainlab recommends using a 7.5 mm collimator, as the tungsten sphere in the Phantom Pointer
is 5 mm in diameter.
The sphere generates a non-irradiated area on the film. This projection of the tungsten sphere
must always be completely inside the exposed film area for every gantry and table position.
Do not use theLightfield Pointer for the Winston-Lutz test. This pointer should only be used
for calibrating the collimator mount.
Setup
How to Perform the Test
Steps
90
③
Affix the Phantom Pointer ④ to the couchmount adapter.
1.
Use the couch translations to bring the Phantom Pointer close to the isocenter as de-
2.
fined by the room lasers.
Use the translations of the couchmount to move the Phantom Pointer into the isocen-
3.
ter position (fine adjustment).
Insert the film holder ③ into one of the two sockets on the collimator mount. Choose
4. the socket that provides the largest range of gantry and couch rotation while avoiding
possible mechanical collision.
Prepare a light-proof 8" x 4" strip of ready-pack film by marking off 8 areas, numbered
5. 1 to 8 on the envelope. This allows for film exposure in 8 gantry and couch angle com-
binations.
④
Figure 50
Hardware User Guide Rev. 4.9 RT / RS Stereotactic Hardware