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Related Concept Videos

Computed Tomography01:10

Computed Tomography

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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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Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies
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Real-time tomosynthesis for radiation therapy guidance.

Scott S Hsieh1, Lydia W Ng2,3

  • 1Department of Radiological Sciences, Univ. of California Los Angeles, Los Angeles, CA, USA.

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|August 25, 2017
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Summary

This study introduces a real-time tomosynthesis system offering superior contrast for lung tumor treatment guidance compared to fluoroscopy. The novel design achieves high frame rates and low radiation doses, enhancing treatment accuracy.

Keywords:
SBRTfast tomosynthesislung tumormotion management

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Area of Science:

  • Medical Imaging
  • Radiation Oncology
  • Image Guidance

Background:

  • Fluoroscopy is widely used for treatment monitoring due to its speed.
  • However, fluoroscopy's limited contrast hinders precise guidance in applications like lung stereotactic ablative radiation therapy.
  • Improved imaging contrast is crucial for accurate tumor targeting during radiation therapy.

Purpose of the Study:

  • To describe and evaluate a novel real-time tomosynthesis system.
  • To assess its capability to provide sufficient contrast for lung tumor treatment guidance.
  • To achieve high temporal resolution for dynamic treatment monitoring.

Main Methods:

  • A tomosynthesis system design utilizing parallel acquisition with multiple sources was proposed.
  • Simulated images were generated from clinical datasets to assess performance.
  • The impact of varying the number of sources and tube power on tumor visualization was investigated.

Main Results:

  • Tomosynthesis imaging demonstrated significantly clearer tumor visualization compared to fluoroscopy.
  • Image contrast improved with an increased number of sources, with a minimum of four recommended.
  • Effective imaging was achieved at low system power (less than 1 mA) due to the high contrast of lung tissue.

Conclusions:

  • The developed tomosynthesis system provides adequate images for real-time radiation therapy guidance.
  • The system offers high frame rates and low radiation dose with modest hardware requirements.
  • Further research, including prototype development and dosimetry studies, is necessary to confirm clinical feasibility.