Needle position during (125)I seed implantation: accurately recognized by sagittal transrectal ultrasonography [corrected].
OBJECTIVE
The aim of this study was to assess the variation of probe rotation angles for detecting a single needle using sagittal images of transrectal ultrasonography (TRUS).


METHODS
A phantom study was performed. One needle was inserted through each of 10 holes of the template, and variations in the probe rotation angles for detecting the needle were measured.


RESULTS
The mean variation of probe rotation for detecting a single needle was 17.0 degrees (range 4 degrees -25 degrees ). Slightly broader variation was seen for the needle in holes farther away from the probe.


CONCLUSIONS
Probe rotation angles for detecting a single needle displayed considerable variation. Seed locations recognized on sagittal imaging by TRUS are thus indeterminate, and real-time dose calculations using TRUS for (125)I seed implantation should be used with care.
Ishiyama
Hiromichi
H
Department of Radiology, Kitasato University School of Medicine, 1-15-1 Kitasato, Sagamihara, 228-8555, Japan. hishiyam@kitasato-u.ac.jp
Kotani
Shouko
S
Satoh
Takefumi
T
Uemae
Mineko
M
Baba
Shiro
S
Hayakawa
Kazushige
K
D001918:Brachytherapy / Q000295:instrumentation / Q000379:methods*; D006801:Humans; D007457:Iodine Radioisotopes / Q000627:therapeutic use*; D008297:Male; D009339:Needles; D019047:Phantoms, Imaging; D011471:Prostatic Neoplasms / Q000000981:diagnostic imaging / Q000532:radiotherapy; D012007:Rectum / Q000000981:diagnostic imaging*; D015203:Reproducibility of Results; D018084:Ultrasonography, Interventional / Q000379:methods
D007457:Iodine Radioisotopes