Biograph mMR

Simultaneous MR and PET in clinical use.

Biograph mMR
Skontaktuj się z nami

We've designed the first PET detectors that allow the integration of whole-body MR and PET - without compromising the performance of either modality.

Overview Technical Details
Field strength3 Tesla
Bore size60 cm
System length199 cm
System weight (in operation)9.0 tons
Minimum room size33 m²
RF Tim[102 x 18] [102 x 32]
Gradient strengthMQ Gradients (45 mT/m @ 200 T/m/s) with 2nd order shim
Helium consumptionZero helium boil-off technology

Siemens' technologies                                                        


MR information is used to correct the position of each event in PET raw data, according to its real position in space measured by MR. This provides sharper images, better contrast and improved quantification through simultaneous acquisition.


Reconstruction point-spread function (PSF) for better PET image quality, improved resolution1, and visual improvements in signal-to-noise2.


Routine respiratory gating of PET and MRAC data for sharp images with minimal setup time.


PET specifications

The integrated state-of-the art PET detectors and detector cooling channels help to ensure optimal PET performance in Biograph mMR.

PET Detectors 
Crystal materialLSO
Crystal element dimension4 x 4 x 20 mm
NEMA 2007 – Transverse spatial resolution 
FWHM @ 1 cm4.4 mm
Sensitivity13.2 cps/kBq
Peak NEC rate (@ 21.8 kBq/cc)175 kcps
Axial FoV for PET258 mm

Magnet technology

Biograph mMR includes TrueForm Magnet Design. This results in better image quality by reducing the unusable edges in the images as well as better fat saturation for the whole area covered in a scan.

Field strength3 Tesla
Bore size60 cm
Magnet length163 cm
Helium consumptionZero helium boil-off technology

Gradient system

Biograph mMR includes an actively shielded whole-body gradient system for excellent spatial and temporal resolution, enabling patient-specific shimming.

GradientsMQ Gradients: 45 mT/m
Slew rateMQ Gradients: 200 T/m/s

RF technology

Tim´s revolutionary all digital-in/digital-out design Direct RF allows for higher SNR and improved stability. All transmit and receive components are located at the magnet.

  • Uniform RF distribution in all body regions
  • Optimized amplitude and phase transmission settings
  • Homogeneous B1 distribution

New Coils with syngo MR B20P:

  • mMR Head Coil
  • mMR Breast Coil (for imaging and biopsy)
  • Special Purpose Coil

Siting and installation

Siting one system instead of two allows a significant reduction in costs.

System length199 cm
System weight (in operation)9.0 tons
Minimum room size33 m2

Biograph mMR requires an installation space similar to a conventional 3T MRI system, thus making the most of your precious space. One room, one cooling system, one operator.

Produkty, usługi i zasoby powiązane

1Results shown to characterize HD•PET algorithm in a non-clinical, non-NEMA setting. Results show average of transverse radial and transverse tangential FWHM as a function of distance from isocenter. Measurements were taken with a point source suspended in air at radial positions from 1 centimeter outwards in 4 centimeter steps. Data shown is to a diameter of 50 cm. The current definition of resolution within the NEMA protocol defines the ability to distinguish 2 closely spaced lesions. This ability cannot be derived from this measurement as HD•PET

is a non-linear reconstruction method. The point source data were reconstructed both with a standard filtered back projection algorithm using FORE rebinning (conventional) and an iterative algorithm using TrueX (HD•PET) with 6 iterations and 21 subsets. The FWHM measurements for TrueX were estimated by calculating a variance using 5 points centered on the peak of the experimental data with a 2 millimeter pixel size. Variance was converted to a FWHM assuming a Gaussian model. This method accounts for the small number of pixels within the FWHM which precludes the use of standard NEMA methodology.

2Conventional reconstructed images compared to images reconstructed with HD•PET.