Modification of annular phased array heating pattern.
By attaching 8 pairs of opposing Al-flaps, which have an angle of 30 degrees or 60 degrees with E-field direction in annular phased array (APA), on both sides of APA we could enhance the E-field in the pelvic heating center by a factor of 2 to 3 and also could decrease the E-field ratio of neck/pelvic center and ankle/pelvic center more than 50% compared with conventional use without Al-flaps between RF range of 50 and 90 MHz except 70 MHz. But that of pelvic surface/pelvic center was suppressed 30% only when 30 degrees angled 8 Al-flaps used.
Uehara
S
S
National Hospital Kyushu Cancer Center, Department of Radiotherapy, Fukuoka, Japan.
Omagari
J
J
Hata
K
K
D006801:Humans; D006979:Hyperthermia, Induced / Q000295:instrumentation / Q000379:methods*; D008961:Models, Structural; D009369:Neoplasms / Q000628:therapy