[Dosimetric problems and their solution in the preparation of a 6-dual-field total-skin technique].
The six-field total skin electron irradiation (TSEI) technique needs an accurate preliminary dosimetric study. The American Association Physics in Medicine (AAPM) defined a dosimetric protocol that recommends the careful dosimetry of the horizontal, the dual and the six-dual fields by using both a cubic and a cylindrical phantoms. In our Institute, in a TSEI development program, we carried out the preliminary dosimetry according to AAPM criteria. We also investigated some dosimetric problems--e.g., the so-called "cable effect", which takes place when the detector cable in a TSEI field is not well shielded, polarity effects and photon contamination. As to the "cable effect", it is especially marked with the Markus NE2534 chamber; moreover, this effect, if not considered, can lead to overestimation of X-rays contamination.
Fiorino
C
C
Servizio di Fisica Sanitaria, IRCCS Ospedale San Raffaele, Milano.
Cattaneo
G M
GM
Del Vecchio
A
A
Fossati
V
V
Fusca
M
M
Longobardi
B
B
Signorotto
P
P
Volterrani
F
F
Calandrino
R
R
D002138:Calibration; D005374:Filtration / Q000295:instrumentation; D006283:Health Physics; D006801:Humans; D008961:Models, Structural; D011879:Radiotherapy Dosage; D012867:Skin / Q000528:radiation effects*; D012955:Societies, Medical; D014481:United States; D014916:Whole-Body Irradiation / Q000295:instrumentation / Q000379:methods*
Alcuni problemi dosimetrici e loro soluzione nella preparazione di una tecnica di total skin a sei campi duali.