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Laparoscopic Probe CXS-OP-SZL


For use in endoscopic surgery, at deep-set lymph nodes, minimally invasive surgery, lymph nodes in Cervical and Prostate Cancer and for research projects, for example with the presence of lymph nodes behind the sternum or in the lung area, there is a growing need for long narrow probes that fit through a trocar.

Flex probeWith a probe tip diameter of only 10 mm the probe has a sensitivity of up to 23,000 counts/s/MBq. The collimator is made of tungsten, is completely integrated and 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, the whole spectrum of applications is covered:

  • 0° - sensitivity direction along the probe axis
  • 45° - 45° to the probe axis
  • 90° - orthogonal to the probe axis


The probes are optimized for an energy range about 149 keV (99mTc) and can be used for gamma energies from 70 keV (201Tl) up to 511 keV (PET). The laparoscopic probes are completely closed and work without changeable collimator sleeves.

The probe can not be protected by a sterile latex cover. Therefore sterilizing the whole probe including its cable by an appropriate sterilization method is needed. We recommend the low temperature plasma sterilization (T < 60° C) or the ethylene oxide sterilization. Steam sterilization is not possible.

Technical Data

Detector CsI:Tl-scintillation crystal Ø 4mm x 6mm long, read out by a 10 mm2 pin-photodiode
Gamma-energy Range 60 keV … > 511 keV
View direction 0° CXS-OP-SZL - Straight measuring direction; collimation 45 °
View direction 45° CXS-OP-SZL-45 - Measuring direction of 45° from the axial. Collimation 77° / 62°
View direction 90° CXS-OP-SZL-90 - Measuring direction of 90° from the axial. Collimation 77° / 65°
Probe Properties (all three types) Length: 515 mm
Length cable: 3m
Diameter hand piece:20 mm
Diameter of tip: 10mm
Weight: 7 ounce (200 g)
Special Features No additional collimator sleeves available

Spatial Resolution, Angular Resolution, Sensitivity

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

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

Background Sensitivity

Zero effect < 0.3 cps = 18 c/min


Sensitivity of the 0°- Laparoscopic probe CXS-OP-SZL-0 as a function of distance of probe tip - lymph node.

Angular Resolution

Angular resolution of the 0°-Laparoscopic probe CXS-OP-SZL-0 in the near field (3cm) and far field (10 cm).

Spatial Resolution

Spatial resolution of the 0°-Laparoscopic probe CXS-OP-SZL-0 in the near field (1cm).
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