Direct conversion, solid-state CZT semiconductor technology

Pixel Size: 

BSGI 3.2mm vs CZT 2.46mm

Energy Resolution (FWHM) for Tc-99m:

BSGI >15% vs CZT <6%

Result of CZT Detectors is:

Better Sensitivity, Better Contrast, and Better Image Quality 

MBIS is an authorised distributor of the GE Discovery NM750b Molecular Breast Imaging system throughout Australia and New Zealand.

Contact us for further information and to request a product brochure.


Detectors at 0°


Detectors at ±90° 


Detectors at at ±45° 


Registered Collimator Design

  • Lead collimator holes are fully aligned to the 2.46mm pixel size on the CZT crystal for optimised spatial resolution & sensitivity

  • ​The registered collimator has square holes that are matched to the individual crystal pixels in both the shape and location

  • Improved resolution and sensitivity result from signals prevented from landing between or across pixels.  Therefore not detected as partial photons or rejected like scatter photons

  • High efficiency collimator combined with dual detector design enables improved resolution and sensitivity without compromising lesion detectability

Advanced Technology for Superior Performance

Optimised Workflow

Clearly Designed for the User

  • Standard mammography gantry with easy positioning style and simple interface

  • Automated positioning - single click buttons to move cameras automatically from CC, MLO, and Axilla positions for efficient workflow

  • Static mode and dynamic mode scan, enabling motion detection

  • Standard mammography views, only 4-8 planar images per exam

  • MBI viewer enables flexible breast imaging interpretation

  • MBI images are fully DICOM compatible

  • List mode available to advance research capability

GE Discovery NM750b comes with Xeleris 3.1 processing workstation

One-button, pre-programmed express setups

  • The GE Discovery NM750b uses Dual detectors ensuring more breast tissue is closer to the detectors leading to better lesion detection. 

  • It uses direct conversion Cadmium Zinc Telluride (CZT) semiconductor technology, converting the Gamma ray directly to electrical charge.

  • Older technology BSGI cameras use Sodium Iodide scintillation crystals where the Gamma ray is firstly converted to a light signal and then converted to an electrical signal.

  • Direct conversion leads to Greater Sensitivity and Higher Resolution, resulting in faster, clearer and more precise images.

Greater Clinical Confidence

BSGI Detector                                                     CZT Detector

  *Comparison made at equal count density to clinical exams

BSGI vs CZT Detectors

  • Miniature and High Performance CZT Semiconductor Detectors

  • Dual head configuration has aligned heads so that images can be combined to potentially enable improved lesion detection

  • Single calibration map for all isotopes

  • Registered collimator (collimator holes aligned to the CZT pixels)

  • Detector and collimator stationary during scan

  • Option to acquire and reframe time sliced images

  • Improved energy resolution and scatter rejection compared to standard NaI detectors

  • Direct Conversion eliminates the need for PMTs and linearity calibrations

  • GE CZT detectors provide pre-corrected Sensitivity Uniformity providing uniform image quality

  • Short periodic calibration procedure

  • Daily quality control (DQC) can be completed in 10 minutes

  • No collimator exchange between scans or calibration

Designed with a Woman in Mind

Mechanically Registered Dual Detectors

  • Physically aligned top and bottom detectors precisely match each other

  • Enhanced clinical confidence with verification that a suspected lesion appears in the same position by both heads in each image

  • When an image is taken, the system automatically "sums" the top and bottom images to make one higher count combined image enhancing the signal to noise, delivering better lesion detectability

Direct Conversion Detectors Powered by CZT

  • Up-close scanning-only the region of interest, including the chest wall

  • Minimising detector-to-tissue distance to increase sensitivity

  • Improved spatial resolution - collimator is precisely matched to individual detector pixels

  • Up to three times the sensitivity of conventional nuclear detectors

  • No crosstalk and edge-free imaging across the entire field of view

Ergonomically Designed for the Patient

  • Light, pain-free immobilisation used during exam; no painful compression
  • Scanned in either seated or standing position, whichever is more comfortable
  • Flexible gantry positioning; 360 degree rotation of detectors for the most favourable position
  • Fits most patients - Large 24 x 16cm field of view for maximum breast coverage and any breast tissue type
  • Claustrophobia-free open design