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Monitoring computed tomography (CT) technologist changes at scan time is crucial for workflow quality. Analysis revealed various reasons for modifications, highlighting needs for technologist training and protocol optimization.

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Area of Science:

  • Medical Imaging
  • Radiologic Technology
  • Healthcare Quality Improvement

Background:

  • Effective monitoring of computed tomography (CT) workflows requires understanding scan-time modifications.
  • Technologist-driven changes can impact image quality, radiation dose, and protocol efficiency.

Purpose of the Study:

  • To quantify the frequency of scan-time changes made by CT technologists.
  • To understand the motivations behind these modifications.
  • To document changes for quality assurance in CT imaging.

Main Methods:

  • Collected 1 year of CT scan acquisition data from a single scanner.
  • Developed an algorithm to group irradiation events by unique acquisition parameters.
  • Classified "one-off" examinations to categorize scan-time change motivations.

Main Results:

  • Analyzed 132,707 irradiation events, identifying 144 "one-off" modifications.
  • Classifications included rarely used protocols (25%), service scans (17%), and protocol adaptations for patient size (15%).
  • Other reasons included unknown changes (16%), allowable modifications (12%), maxed tube current (8%), and radiologist-requested dose changes (6%).

Conclusions:

  • Scan-time modifications indicate opportunities for enhanced CT technologist training.
  • Protocol optimization is needed to improve CT workflow efficiency and consistency.
  • Understanding technologist behavior is key to maintaining high-quality CT imaging standards.