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Local diagnostic reference levels for typical radiographic procedures.

Elena Tonkopi1, Cupido Daniels, Mary J Gale

  • 1Diagnostic Imaging Department, QE II Health Sciences Centre, Halifax, Nova Scotia, Canada. lena.Tonkopi@cdha.nshealth.ca

Canadian Association of Radiologists Journal = Journal L'Association Canadienne Des Radiologistes
|December 6, 2011
PubMed
Summary
This summary is machine-generated.

Diagnostic reference levels (DRLs) were established for digital radiography (DR) and computed radiography (CR) in a hybrid imaging department. Local DRLs were generally lower than national recommendations, highlighting the importance of modality-specific optimization.

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Area of Science:

  • Medical Imaging
  • Radiological Physics
  • Radiation Protection

Background:

  • Establishing local diagnostic reference levels (DRLs) is crucial for optimizing radiation dose in digital imaging institutions.
  • Variations in radiation dose are common across different imaging modalities and equipment.

Purpose of the Study:

  • To establish local diagnostic reference levels (DRLs) for standard radiographic examinations in a fully digital imaging setting.
  • To compare radiation doses between computed radiography (CR) and digital radiography (DR) systems.

Main Methods:

  • Conducted a survey of 6 standard radiographic projections across 19 CR and DR rooms.
  • Calculated entrance surface dose (ESD) for 226 average-sized adult patients.
  • Utilized anthropomorphic phantoms to investigate dose variations, focusing on CR chest, abdomen, pelvis, and lumbar spine examinations.

Main Results:

  • Digital radiography (DR) rooms showed lower patient doses than computed radiography (CR) rooms by factors of 1.2 to 3 (except for chest exams).
  • Standardizing CR exposure index reduced ESD by 21%-30%.
  • Antiscatter grid cutoff significantly impacted dose (up to 46% difference), while detector sensitivity had minimal effect (2%) and collimation reduced dose by 17%.

Conclusions:

  • Modality-specific local DRLs were successfully established for standard examinations in a hybrid digital imaging department.
  • Established local DRLs were typically lower than Safety Code 35 recommendations, with CR chests being an exception.
  • Key factors influencing dose variations, such as antiscatter grids and exposure index standardization, were identified and quantified.