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

1. Description

if you can read this, then something went wrong.

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.

if you can read this, then something went wrong.

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.

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

if you can read this, then something went wrong.
if you can read this, then something went wrong.
Angular Resolution
if you can read this, then something went wrong.
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