Optimization of computed tomography (CT) arthrography of hip for the visualization of cartilage: an in vitro study
| Autor: | Bruno Beomonte Zobel, Victoria Alvarez Miezentseva, Pierre-Philippe Leyder, Laura Scarciolla, Carole Maréchal, Françoise Malchair, Adelin Albert, Paolo Simoni, Philippe Gillet |
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| Rok vydání: | 2013 |
| Předmět: |
Cartilage
Articular musculoskeletal diseases medicine.medical_specialty media_common.quotation_subject Radiation Dosage Sensitivity and Specificity Effective dose (radiation) Imaging phantom Radiation Protection Iodinated contrast Cadaver Bone plate medicine Humans Contrast (vision) Radiology Nuclear Medicine and imaging Arthrography media_common business.industry Cartilage Reproducibility of Results Middle Aged Radiographic Image Enhancement medicine.anatomical_structure Orthopedic surgery Radiographic Image Interpretation Computer-Assisted Hip Joint Tomography X-Ray Computed Nuclear medicine business Algorithms |
| Zdroj: | Skeletal Radiology. 43:169-178 |
| ISSN: | 1432-2161 0364-2348 |
| DOI: | 10.1007/s00256-013-1759-4 |
| Popis: | We sought to optimize the kilovoltage, tube current, and the radiation dose of computed tomographic arthrography of the hip joint using in vitro methods. A phantom was prepared using a left femoral head harvested from a patient undergoing total hip arthroplasty and packed in a condom filled with iodinated contrast. The right hip joint of a cadaver was also injected with iodinated contrast. The phantom and the cadaver were scanned using different values of peak kilovoltage (kVp) and tube current (milliamp seconds, mAs). Three different regions of interest (ROI) were drawn in the cartilage, subchondral bone plate, and intraarticular contrast. The attenuation values, contrast/noise ratio (CNR), and effective dose were calculated. Two independent observers classified the quality of the contrast-cartilage interface and the cartilage-subchondral bone plate interface as (1) diagnostic quality or (2) nondiagnostic quality. Contrast, cartilage, and subchondral bone plate attenuation values decreased at higher kVp. CNR increased with both kVp and mAs. The qualitative analysis showed that in both phantom and cadaver, at 120 kVp and 50 mAs, the contrast-cartilage and cartilage-subchondral bone plate interfaces were of diagnostic quality, with an effective dose decreased to 0.5 MSv. The absolute effective dose is not directly related to the quality of images but to the specific combination of kVp and mAs used for image acquisition. The combination of 120 kVp and 50 mAs can be suggested to decrease the dose without adversely affect the visibility of cartilage and subchondral bone plate. |
| Databáze: | OpenAIRE |
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