High-resolution digital x-ray detector utilizing a discrete array of CdWO4 scintillators and a self-scanned...

Area of Science:

• Medical Imaging
• Detector Physics
• Materials Science

Background:

• High-resolution X-ray imaging requires advanced detector technology.
• Minimizing light crossover and channel variations is crucial for detector array performance.

Purpose of the Study:

• To describe a novel high-resolution X-ray detector array.
• To evaluate the detective quantum efficiency (DQE) and resolution of the array.

Main Methods:

• Constructed a detector array with discrete CdWO4 scintillators and a Reticon 1024S photodiode array.
• Used aluminum foil separators to minimize light crossover between scintillator elements.
• Evaluated individual channel and array-wide DQE, and assessed resolution using the edge response function.

Main Results:

• Individual detector channels achieved a DQE of 0.38.
• Significant systematic variations were observed between channels.
• Array-wide DQE, with simple correction, was 0.04.
• The array demonstrated resolution comparable to a detector with a Gaussian line spread function (0.172 mm standard deviation).

Conclusions:

• The developed X-ray detector array shows promise for high-resolution imaging.
• Channel-to-channel variations significantly impact overall array DQE, necessitating further correction strategies.
• The resolution performance is encouraging for advanced imaging applications.