One image.
All the counts.
Motion eliminated.

The goal: the clearest, most accurate image possible.

Q.Freeze combines the quantitative benefits of 4D phase-matched PET/CT imaging into a single static image.  By collecting CT and PET data at each phase of the breathing cycle, then matching the data for attenuation consistency.  None of the acquisition data is wasted, as 100% of the counts collected are combined to create a single static image.  The goal – a resulting image that has the dual benefit of frozen patient motion and reduced image noise.


The induced motion artifacts from respiratory motion may introduce significant image distortion, potentially leading to clinical misinterpretation involving apparent increase of lesion size and reduction of measured Standardized Uptake Value (SUV), and in many cases, potential miss of small lesions.

Q.Freeze addresses each of these challenges by creating a single static image corrected for respiratory motion using a low dose CT technique.

The resulting image has multiple benefits: 

  • Frozen patient motion 
  • Reduced image noise 
  • Consistency quantitative accuracy


Q.Freeze has been designed to overcome these challenges by using the entire acquired data to create a single 3D motion corrected image, and to provide quantitative accuracy equivalent to 4D phase-matched PET/CT. Unlike conventional 4D PET imaging, Q.Freeze combines 100% of the PET counts into a 3D motion corrected image that has a comparable acquisition time and the equivalent image noise of a static acquisition.