Gamma probe system: SURGEOGUIDE II model

A gamma probe is a handheld device used for intraoperative use following interstitial injection of a radionuclide, to locate regional lymph nodes by their radioactivity. It is used primarily for sentinel lymph node mapping and parathyroid surgery. Radionuclides which uses usually are Tc-99m, I-131 & F-18. Gamma probes can also be used in open surgery, laparoscopy and theroscopy (inside the body), and can be used externally (outside the body). Most use of gamma probes is in Sentinel Lymph Node Biopsy (SLNB) and Radio-Guided Occult Lesion Localization (ROLL). But these systems can be used in all cases where the detection of small points with high activity distribution, high sensitivity and resolution is desired.

Clinical applications:

  • Breast cancer
  • Gynecological cancers (cervical, ovarian, uterine, vaginal and vulvar)
  • Melanoma and other types of skin tumors
  • Head & Neck
  • Endocrine cancers (thyroid, parathyroid)
  • Urology cancers (prostate, bladder, testicular, kidney and penile)
  • Nuclear Medicine (localization of gamma labeled areas)


Probe specifications:

  • Three types of Probes: Large Tip, Small Tip, Endoscopic
  • Length: 21 cm
  • Tip Diameter: 16 mm (Large), 11 mm (Small), 10 mm (Endoscopic)
  • Stainless Steel Body , Tungsten Collimator
  • Crystal: CsI(Tl)

NEMA-NU3 standard test results:

  • Sensitivity: ~2K cps/MBq @ 3 cm
  • Shielding Efficiency: 99.6 % for Tc-99m
  • Energy Resolution: < 11% FWHM for Tc-99m
  • Angular Resolution: 30˚, 45˚, 95˚ (optional)
  • Local Resolution: < 40 mm FWHM at 5 cm distance (For Large Probe)

System Specifications:

  • 5 digit display
  • Linear bar graph
  • Sound modulated with count rate
  • Scale select volume
  • Isotope select volume
  • Beep/FM sound
  • 12 DC – 40W Adapter

Environment Requirements:

  • One phase 220 volt Power (for adaptor input)
  • Dimensions: 22 × 25 × 22 (depth × height × width)
  • Weight: 3Kg
  • Temperature range: 15° - 35°C

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