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X-ray Dose Reduction through Adaptive Exposure in Fluoroscopic Imaging
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Study on the dose profile in CT-fluoroscopy.

A D Oliveira1, J Pereira1, S Sarmento2

  • 1Universidade de Lisboa (UL), Instituto Superior Técnico (IST), Laboratório de Proteção e Segurança Radiológica (LPSR), Estrada Nacional 10 (ao km 139,7), Bobadela LRS, 2695-066, Portugal; UL-IST, Centro de Ciências e Tecnologias Nucleares (C2TN), Estrada Nacional 10 (ao km 139,7), Bobadela LRS, 2695-066, Portugal.

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Summary
This summary is machine-generated.

This study introduces a function model to accurately describe dose profiles in Computed Tomography Fluoroscopy (CTF). This model improves CTDI calculations by providing precise slice thickness estimations, reducing overestimations up to 20%.

Keywords:
CTDICTFComputed tomography fluoroscopyDose profile

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Area of Science:

  • Medical Physics
  • Radiological Imaging

Background:

  • Accurate dose assessment in Computed Tomography Fluoroscopy (CTF) is crucial for patient safety.
  • Existing methods may not fully capture dose distribution, especially off the rotation axis.

Purpose of the Study:

  • To develop and validate a function model for describing single slice dose profiles (SSDP) in CTF.
  • To accurately estimate slice thickness and its impact on dose calculations, particularly off the isocenter.

Main Methods:

  • A function model was developed to fit SSDPs within the CT gantry.
  • The model was validated using GafChromic film measurements.
  • SSDP parameters were determined at the isocenter and at 8 cm and 16 cm off the isocenter.

Main Results:

  • The function model successfully described SSDPs, allowing for slice thickness estimation at various points.
  • Using nominal slice thickness instead of the model's estimation led to CTDI overestimations as high as 20%.

Conclusions:

  • The developed model provides a good description of CTF dose profiles.
  • Accurate slice thickness estimation is vital for precise CTDI calculations, preventing significant overestimations.