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Digital Photon Counting

Unlike analog PET/CT scanners that use photomultipliers, or analog SiPMs to detect light, the Vereos PET/CT scanner uses proprietary Digital Photon Counting (DPC) technology. DPC technology converts light directly to a digital signal with zero analog noise.

1:1 coupling

Each crystal is connected to a single digital photon counting detector. This 1:1 coupling, combined with 325 ps Time-of-Flight (TOF) timing resolution and reduced pile-up effects, allows for a much higher count rate capability and improved spatial resolution compared to analog* systems.


≈ 2x volumetric resolution*

The system uses 1:1 coupling of crystals to digital detectors. This means spatial, timing, and energy resolution is improved throughout the entire field of view, for improved volumetric resolution.

*Compared to GEMINI TF PET/CT

≈ 2x sensitivity gain*

Philips Digital Photon Counting technology converts light directly to a digital signal. Because there is virtually no noise introduced in this conversion, the system improves the signal-to-noise ratio which enables improved sensitivity.

*Compared to GEMINI TF PET/CT

≈ 2x quantitative accuracy*

Vereos has improved quantitative accuracy of +/- 5% when compared to +/- 10% seen with analog systems.*

*Compared to GEMINI TF PET/CT

Premium image quality

iDose4 improves image quality* through artifact prevention and increased spatial resolution at low dose.

*Improved image quality is defined by improvements in spatial resolution and/or noise reduction as measured in phantom studies.

Improved workflow efficiency

iPatient drives confidence and consistency through personalized patient-centric workflow. The iPatient platform can reduce time-to-results by 24% and clicks per exam by 66%*.

*Buchan, K. (Philips Healthcare), Dharaiya E. (Philips Healthcare), Ardley N. (Monash Health, Australia) “Impact of workflow tools in reducing total exam and user interaction time - 4 phase liver computed tomography exams.”

How digital photo counting works

small chip animation

The DPC detector tile consists of an array of 64 pixels. Each pixel couples directly to a single scintillation crystal.

large sensor animation

Each pixel contains thousands of microcells that enable detection of single photons. Each photon is converted directly into a pure binary output signal.

Advantages of digital detection

In conventional analog PET scanning, photomultipliers that are used to detect light output from the scintillator are limited in counting capabilities due to size and processing capabilities. To count photon events, light emitted from the scintillator is dispersed to multiple photomultiplier detectors. This sharing of information limits the capability of the PET detector to accurately process count rate information and location of the origin of the photon.

The Philips difference is digital. Unlike analog PET/CT scanners that use photomultipliers to detect light, the Vereos PET/CT scanner uses proprietary Digital Photon Counting (DPC) technology. It detects photons emitted from radiotracers individually by converting the scintillating light that collects them directly into a digital signal. This 1:1 coupling of crystals to light sensors provides faster time-of-flight than analog*, and approximately twice the sensitivity gain, volumetric resolution and quantitative accuracy.

mobile analog mobile analog
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AMI DPC Photon Screen 1 AMI DPC Photon Screen 2

Preliminary performance data*

Number of Detectors


System spatial resolution


Effective system sensitivity

22.0 kcps/MBq

Effective peak NECR

> 650 kcps @ 50 kBq/mL

Maximum trues

> 675 kcps

System timing resolution

325 ps

Quantitative accuracy

+/- 5%

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Download DPC Technical Overview

*Preliminary performance is subject to change

To learn more about the Vereos Digital PET/CT scanner, please call 1-800-229-6417, or request information.

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