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2004 ; 5
(2
): 82-90
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Evaluation of an automatic needle-loading system
#MMPMID15738915
Morrier J
; Varfalvy N
; Chrétien M
; Beaulieu L
J Appl Clin Med Phys
2004[Spr]; 5
(2
): 82-90
PMID15738915
show ga
The purpose of this paper is to evaluate the dosimetric capabilities and the
radiation protection (RP) performance of a new automatic needle-loading system
for permanent prostate implants, the Isoloader (Mentor Corp.). The unit has been
used in more than 100 clinical cases at our institution. The Isoloader is a
computerized workstation that allows automated seed testing by a solid-state
CdZnTe radiation detector and loading in surgical needles. The seeds are received
in a shielded and ready-to-use cartridge. Radiation protection measurements were
done on a cartridge filled with 67 (125)I seeds and during dosimetric seed
verification and needle loading. The reproducibility of the detector was tested
and its accuracy was determined by comparison to specified activities of six
calibration seeds and to their measurements in a calibrated well-chamber (WC).
Finally, the times required to complete dosimetric verification and needle
loading were evaluated. The cartridge was found to be adequately shielded, since
no significant amount of radiation was detected around it. Radiation during seed
assay was found to be worst at the cartridge's bottom, where it has a value of
15.2 microSv/h (1.4 microSv/h at 10 cm). For the needle-loading task,
measurements were performed with a typical needle (three seeds) at the shielded
needle holder surface yielding 307.2 microSv/h (8.3 microSv/h at 20 cm). Seed
dosimetric verification takes an average of 15 s/seed, while it takes a mean time
of 50 s/needle to complete the loading task. Measurements of the six seed
activities were within 0.65% of the ordered activities and 1.9% higher on average
than those from the WC (min = 0.7%; max = 3.5%). The reproducibility of the
measurements of the CdZnTe detector was excellent, with an average of 0.01% of
deviation from a reference measurement (N = 120; = 1.9%). We therefore conclude
that the Isoloader is a safe, fast, and effective needle-loading system.
|*Needles
[MESH]
|Brachytherapy/*instrumentation
[MESH]
|Equipment Design
[MESH]
|Equipment Failure Analysis
[MESH]
|Injections/*instrumentation/methods
[MESH]
|Iodine Radioisotopes/*analysis/therapeutic use
[MESH]
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