Gamma Probe Detector

Wireless Bluetooth-Probe “Crystal Wireless Probe”

The lightweight, compact gamma probe Crystal Wireless Probe is an ingenious precision instrument that works without any annoying cables. Thanks to its flexible signal transmission concept, the user now even has the freedom to decide to connect Crystal Wireless Probe to one of our control units SG03 and SG04 [Crystal Probe-automatic-], Windows [PC, laptop] or Android [Tablet PC Smart-phone]. A reliable and long lasting performance is guaranteed even under difficult conditions by the lightning-fast setup in combination with persistent batteries.

Crystal Wireless Probe has excellent detection capabilities, meaning an exclusive sensitivity combined with excellent side shielding by the already integrated collimation. In addition, it is constructed to be shock resistant!

Due to all these characteristics Crystal Wireless Probe is an extremely effective and practical instrument to detect radioactive enrichments (intra-) operatively.

lightweight and compact
no disturbing cables
operating with all Crystal Probe Systems, computers (Windows), smartphones (Android)
outstanding sensitivity
excellent side shielding (integrated collimation)
shock resistant
very fast setup

Crystal Wireless Probe is designed for the radiation energy of the most used nuclide 99mTc (140 keV) and has optimal parameters for it. The detectable energy range is from 70 keV (201Tl) up to 511keV (PET nuclide). When used intraoperatively the probe has to be protected by a sterile latex cover, as for example a sterile glove.

Technical data

Detector : CsI:Tl-szintillation crystal, Si-pin-photodiode
Gamma-energy range : 60 keV … > 511 keV
Properties length : 242 mm
diameter hand piece : 23 mm
diameter tip : 15 mm
weight (incl. battery) : 200 g
Connection to control unit via : Bluetooth
Range of signal transmission : 10m
Login time (1st login / re-login) : 8-10s / 5s

Collimation and side-shielding

Collimator : probe tip made from surgical steel (outside) with integrated tungsten-collimation (not changeable)
Material : Tungsten, lateral thickness 3,15 mm; rear thickness 4 mm
Dihedral angle (FOV) : 40° FWHM
Side-shielding : 99,97 % @ 140 keV (99mTc)

Background sensitivity

Zero effect < = 10 c/min

Power supply

Battery : Li-ion-cell type CR123A (Panasonic or Duracell)
Nominal voltage and capacity : 3V/1550mAh
Operation time : > 15…16 h
Operation time with „Bat-low“ mode : 0,5…1 h
Power consumption Connection established : ca. 0,24 W
Max. current consumption during login : 143 mA
Protection degree against electrical shock : CF
SMD fuses : 1 x 500 mAF, 4 x 200 mAF

Sensitivity and Resolution

The basic sensitivity is determined by the integrated collimator (40°). The sensitivity is shown in the figure – its depending on the distance between lymph node and probe tip. The Crystal Wireless Probe has a high sensitivity > 18.000 counts/s/MBq.

The angular resolution with a standard collimator (40°) is determined in the near field (distance: 3 cm) and in the far field (distance: 10 cm).

The spatial resolution is determined in the near field (distance: 1 cm). The probe has an excellent spatial resolution < 13 mm (FWHM).

Spatial resolution, angular resolution and sensitivity depend strongly on the actual measurement conditions and from the selected collimator geometry. In the table spatial resolution and sensitivity of different collimators were determined in a water phantom.

Energy spectra

The energy spectra of the probe, recorded with nuclides used most in medicine:

18F (511 KeV-PETNuclide)

123 I (159 KeV)

99mTc (140 keV)

111 In (171 keV, 245 keV)

201Tl (70 keV)

Straight Gamma Probe: “HiSens”

Description

The straight probe “HiSens” is our standard probe for the detection of sentinel lymph nodes in the surgical treatment of cancer (sentinel technique, breast cancer, melanoma).

It outstandingly fulfills the requirements of a modern gamma probe. High sensitivity (> 20.000 counts/s/MBq) with an excellent side shielding (> 99.97% @ 140 keV), good spatial and angular resolution (17 mm, 40°) with a probe diameter of 15 mm. The straight probe allows the exact localization of the labelled lymph node already from some distance just by aiming along the axis of the probe.

The probe is optimized for the energy range around 140 keV (99mTc), and can be used for gamma-ray energies between 70 keV (201Tl) and 511 keV (PET).When used intraoperatively the probe has to be protected by a sterile latex cover, as for example used in ultrasound diagnostics.

Technical Data

Detector : CsI:Tl-scintillation crystal Ø 6 mm x 8 mm long, read out by a 20 mm2 pin-photodiode
Gamma-energy range : 60 keV … > 511 keV
Probe properties : length : 220 mm; length of cable: 3 m diameter hand piece: 20 mm diameter of tip: 15 mm weight: about 7 ounce (200 g)

Collimation and Side-shielding

Material : Tungsten, lateral thickness 3,15 mm (at all collimator sleeves with D = 15 mm), rear thickness 5 mm side shielding = 99,97 % @ 140 keV (99mTc)
Dihedral angle (FOV) : Standard 40° FWHM (20° or 60° on request)