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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.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...

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Updated: Jul 1, 2025

Positron Emission Tomography-based Dose Painting Radiation Therapy in a Glioblastoma Rat Model using the Small Animal Radiation Research Platform

Positron Emission Tomography-based Dose Painting Radiation Therapy in a Glioblastoma Rat Model using the Small Animal Radiation Research Platform

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A Novel Approach for Position Verification and Dose Calculation through Local MVCT Reconstruction.

Jun Zhang^1,2, Zerui Chen², Yuxin Lei²

¹College of Computer Science and Technology, Taiyuan University of Technology, Taiyuan 030024, China.

Diagnostics (Basel, Switzerland)

|March 13, 2024

Summary

This summary is machine-generated.

This study presents a novel radiotherapy patient positioning verification method using electronic portal imaging device (EPID) transmission images. The technique reconstructs megavoltage computed tomography (MVCT) to accurately detect and correct patient positioning errors, improving treatment precision.

Keywords:

EPID MVCT dose calculation positioning verification registration

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Area of Science:

Medical Physics
Radiotherapy Technology
Image Reconstruction

Background:

Cone-beam computed tomography (CBCT) for radiotherapy patient positioning can introduce errors due to isocenter misalignment.
Accurate patient positioning is critical for effective radiation delivery and minimizing off-target dose.

Purpose of the Study:

To introduce an innovative method for precise patient positioning verification in radiotherapy.
To overcome the limitations of traditional CBCT by utilizing the treatment radiation source.

Main Methods:

Acquisition of 10 electronic portal imaging device (EPID) transmission images from distinct angles.
Sparse reconstruction of local megavoltage computed tomography (MVCT) using the ART-TV algorithm.
3D mutual information registration of reconstructed MVCT with planning CT for error detection and correction.

Main Results:

Reconstructed MVCT images meet the requirements for accurate registration.
The registration algorithm effectively identifies patient positioning discrepancies.
The method allows for precise adjustments to the treatment setup and accurate absorbed dose calculation.

Conclusions:

The developed method provides accurate 3D patient positioning verification in radiotherapy.
Utilizing the treatment beam source eliminates errors associated with CBCT isocenter misalignment.
This technique enhances treatment accuracy and patient safety by enabling precise positional corrections.