Laparoscopic Gamma Probes: 0°, 45°, 90°

1. Description

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For use in endoscopic surgery, at deep-set lymph nodes, minimally invasive surgery, lymph nodes in cervix and prostate cancer and for research projects, there is a growing need for long narrow probes that fit through a trocar.

For this new applications the laparoscopic probes of the Crystal Probe System are optimally suited. With a probe tip diameter of only 10 mm the probe have a sensitivity of up to 23.000 counts/s/MBq. The collimator is made of tungsten and completely integrated. It provides a side shielding of > 99% @ 140 keV. For several needs and applications 3 different laparoscopic probes are available that have the same parameters but differ in the "direction of view".

With the 3 probe types: 0, 45, 90 along the probe axis the whole spectrum of applications is covered.

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The minimal-invasive probes are completely closed and work without changeable collimator sleeves. When used intraoperatively the probes has to be protected by a sterile latex cover or to be sterilized the by an appropriate sterilization method. We recommend the low temperature plasma sterilization (T < 60° C) or the ethylene oxide sterilization. CAVE: Steam sterilization would lead to their destruction!

2. Technical Data

Detector CsI:Tl-scintillation crystal Ø 4 mm x 6 mm long, read out by a 10 mm2 pin-photodiode
Gamma-energy range 60 keV … > 511 keV
View direction 0° CXS-OP-SZL, Collimation 45 °
View direction 45° CXS-OP-SZL-45, Collimation 77° / 62°
View direction 90° CXS-OP-SZL-90, Collimation 77° / 65°
Probe properties
(all 3 Types)

length: 515 mm
lenth cable: 3m
diameter hand piece: 20 mm
diameter of tip: 10 mm
weight: 7 ounce (200 g)

Special features no additional collimator sleeves available

2.1 Collimation and Side-shielding

Material Tungsten, lateral 2,25 mm wall thickness, rear 8 mm wall thickness
side shielding > 99% @ 140 keV (99mTc)
Dihedral angle (FOV) depends on probe and position, standard 50° FWHM

2.2 Background sensitivity

Zero effect < 0,3 cps = 18 c/min

2.3 Sensitivity and Resolution

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Sensitivity
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Angular Resolution
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Local resolution
Parameter 45° 90°
Angular resolution in axis direction 45° 77° 77°
angular resolution orthogonal to the axis direction -- 62° 65°
spatial resolution in axis direction [mm] 14 15 18
spatial resolution orthogonal to the axis direction [mm] 14 17 18
sensitivity max. [cps/MBq] 13500 16500 22500
side sensitivity [cps/MBq] 140 120 55
ratio side sensitivity / sensitivity max. 1,00% 0,70% 0,24%
energy range [keV] 50 - 511 50 - 511 50 - 511