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Computed Tomography

Computed Tomography

Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
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Related Experiment Video

Updated: Jul 8, 2026

Lensfree On-chip Tomographic Microscopy Employing Multi-angle Illumination and Pixel Super-resolution

Lensfree On-chip Tomographic Microscopy Employing Multi-angle Illumination and Pixel Super-resolution

Published on: August 16, 2012

Thin-film, flat-panel, composite imagers for projection and tomographic imaging.

L E Antonuk¹, J Boudry, W Huang

¹Dept. of Radiation Oncology, Michigan Univ., Ann Arbor, MI.

IEEE Transactions on Medical Imaging

|January 1, 1994

Summary

New real-time flat-panel imaging arrays enable novel composite detectors. These advanced systems offer improved solutions for radiotherapy patient verification and enhanced accuracy in PET and SPECT imaging through dual-energy capabilities.

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Area of Science:

Medical Imaging Technology
Radiotherapy Physics
Nuclear Medicine Instrumentation

Background:

Development of large-area, flat-panel amorphous silicon hydrogenated (a-Si:H) imaging arrays.
Existing fluoroscopic and radiographic imaging devices have limitations.
Unique properties of flat-panel arrays allow for novel detector configurations.

Purpose of the Study:

To propose the concept of real-time flat-panel composite imagers.
To address patient localization and verification challenges in megavoltage radiotherapy.
To improve attenuation corrections in Positron Emission Tomography (PET) and Single-Photon Emission Computed Tomography (SPECT).

Main Methods:

Utilizing the thin, uniform profile of flat-panel detectors to create composite imaging devices.
Developing a dual-energy composite imager with stacked flat-panel detectors for radiotherapy.
Integrating a flat-panel array for transmission measurements in front of PET/SPECT emission detectors.

Main Results:

Demonstrated feasibility of composite imagers through calculations and data.
Proposed specific embodiments for radiotherapy, PET, and SPECT applications.
Highlighted the potential for unique information acquisition with stacked detector systems.

Conclusions:

Real-time flat-panel composite imagers represent a significant advancement in medical imaging.
These novel configurations offer practical solutions to persistent problems in radiotherapy and nuclear medicine.
The proposed technology promises enhanced diagnostic capabilities and improved patient care.