close is the new home for all Ajat and XCounter information.

Menu menu

Close close

About us

Realising the Future of X-ray Detectors

Read more

Job Opportunities

Here you can find our job opportunities

Read more


Direct conversion – compared to indirect conversion.

Insights from DC


The latest happenings in and around Direct Conversion.

Our news


Upcoming Events and Exhibitions.

Read more

Youtube videos

Subscribe to our youtube channel.

Visit Youtube launch


Follow on us twitter, or give us a tweet.

Give us a tweet launch

X-ray Imaging Detectors

Photon counting, spectral hybrid sensors

Our Technology arrow_right_alt

A Global Leader in X-ray Detectors

We innovate, design, develop and manufacture photon counting, direct conversion, digital X-ray detectors used in medical, dental and industrial systems around the world. Our detectors are:


FAST – operating at conveyor belt speeds of up to and beyond 6m/sec

FLEXIBLE – single energy to dual and multi-spectral

ADAPTABLE – multiple geometries, multiple energy ranges

SOPHISTICATED – multi-modal with fast scanning, frame mode and smart scan mode


Our TECHNOLOGY is photon counting – high signal to noise ratio – zero dark current – high resolution with low dose – high dynamic range, with integrated TDI – charge sharing correction –  CdTe for direct conversion

More About Us

Latest News

Introducing the Varex Imaging Website
Read more arrow_right_alt
REPORT: iWoRiD 2022 Days 1 & 2
Read more arrow_right_alt
WATCH: CTO Christer Ullberg Presents Updates on 4-side Buttable Photon Counting ASIC
Read more arrow_right_alt
Interview: Professor Dr Franz Pfeiffer on Bringing Dark-field Imaging to Clinical CT
Read more arrow_right_alt
CEO Spencer Gunn Reports Surging Demand for Photon Counting X-ray Detectors for Food Inspection
Read more arrow_right_alt
3D Dark-field Imaging In View with TUM’s Launch of Prototype CT System
Read more arrow_right_alt
WATCH: One Second Battery CT – How Do We Do It?
Read more arrow_right_alt
FDA Credit Photon Counting CT as Breakthrough for Medical Imaging
Read more arrow_right_alt

Direct Insights

Insights from Direct Conversion

Understanding our technology and our business

All insights

Introducing the Varex Imaging Website

Learn More

REPORT: iWoRiD 2022 Days 1 & 2

Learn More

Control 2022: Photon Counting X-ray Inspection for Industrial Quality Assurance

Learn More

Frequently Asked Questions

Why does CdTe have high absorption?

CdTe is a compound semiconductor made from cadmium and tellurium. Since the atomic number of both materials is high (Cd:48, Te:52) and CdTe has a high density (5.85g/cm3), it can absorb radiation more effectively.

What are the characteristics of CdTe detectors?

Due to its high density, CdTe is very radiation hard which means that it can be used in applications at very high energies (MeV). This radiation hardness also means that it has a longer lifetime than many other X-ray detectors, being resistive to radiative damage. CdTe detectors also have good spatial resolution and are extremely efficient which allows them to be used in very low dose situations.

What is CdTe?

Cadmium telluride (CdTe) is a stable crystalline compound formed from cadmium and tellurium and can be used as a compound semiconductor. CdTe is used in the next generation X-ray detectors. It absorbs radiation and efficiently converts it to an electronic signal.

What are the differences between CdTe and other radiation detectors?

CdTe is a direct conversion detector and as such does not need to turn the X-ray photon into a light photon before recording it. This means the position of the conversion can be more accurately recorded and the signal is directly related to the energy of the converted photon. Other radiation detectors use scintillators to convert X-rays to light. This process causes significant blur and loss of efficiency.

What is a “scintillator”?

A scintillator is a substance such as gadolinium oxysulfide or caesium iodide that converts an X-ray photon into a light photon. The light photons can then be recorded by a normal CMOS or CCD camera. Light photons travel in all directions, causing a loss of accuracy in spatial resolution. Typically, scintillation technologies are not as efficient as CdTe at stopping X-rays.