Prostate magnetic resonance imaging (MRI) in patients with hip implants-presetting a protocol using a phantom
Yuriy A Vasilev1, Olga Yu Panina1,2, Dmitry S Semenov1
1State Budget-Funded Health Care Institution of the City of Moscow "Research and Practical Clinical Center for Diagnostics and Telemedicine Technologies of the Moscow Health Care Department", Moscow, the Russian Federation.
Background:
Metal structures are a source of artifacts that significantly complicate the interpretation of magnetic resonance imaging (MRI). The use of prostate MRI as a preliminary test in men with a suspicion on prostate cancer leads to an increased use of the test. The aim of this study was to solve a clinically significant problem: to ensure the reduction of artifacts from metal hip implants during prostate MRI. Another goal was to evaluate the impact of artifact reduction methods on quantitative measurements.
Methods:
The prostate gland (PG) phantom model was a cylinder filled with an aqueous solution of polyvinylpyrrolidone at the concentrations of 40%, 30%, and 20% [central zone (CZ), peripheral zone (PZ), and "lesion", respectively]. Phantom MRI study was conducted on Philips Ingenia 1.5T and Philips Ingenia 3T scanners.
Results:
For 1.5 T, the reduction in the influence of artifacts inside region of interest (ROI) was observed, expressed in a decrease in the average apparent diffusion coefficient (ADC) (CZ, PZ, "lesion") for the manual artifact reduction (MAR) and ZOOM (title of software artifact reduction) techniques compared to the standard method. For 3T this effect was not detected. The same ADC results were obtained for Standard and MAR techniques, and increased ADC values for ZOOM. Despite the fact that the spread of ADC values on 3.0T scanners was minimal, there was a significant deviation of ADC values from the reference ones (up to 30.4%). Therefore, it is necessary to use a correction coefficient in the ADC calculation for the 3.0 T device. In the presented clinical case, high-quality tomograms were obtained without any artifacts, despite the presence of two hip replacement devices in the scanning area.
Conclusions:
The accurate prostate MRI in the presence of implants is essential for an accurate diagnosis. This approach allows to reduce artifacts from hip implants, to visualize PG and periprostatic tissue in the best way, and to detect malignant and benign changes.
Insights
Metal hip implants cause artifacts in prostate MRI. New methods reduce these artifacts on 1.5T scanners, improving image quality for cancer diagnosis. Correction is needed for 3T scanners.
Area of Science:
- Medical Imaging
- Radiology
- Prostate Cancer Diagnosis
Background:
- Metal implants create artifacts complicating prostate MRI interpretation.
- Prostate MRI is increasingly used for cancer detection.
- Artifacts from hip implants hinder accurate diagnosis.
Purpose of the Study:
- Reduce artifacts from metal hip implants during prostate MRI.
- Evaluate artifact reduction methods' impact on quantitative measurements.
- Improve diagnostic accuracy in patients with hip implants.
Main Methods:
- Utilized a prostate gland phantom model with varying concentrations.
- Conducted MRI phantom studies on Philips Ingenia 1.5T and 3T scanners.
- Applied manual artifact reduction (MAR) and ZOOM techniques.
Main Results:
- Observed artifact reduction and decreased apparent diffusion coefficient (ADC) on 1.5T with MAR and ZOOM.
- No significant artifact reduction effect detected on 3T scanners.
- 3T scanners showed significant ADC deviation (up to 30.4%), requiring correction coefficients.
Conclusions:
- Accurate prostate MRI with implants is crucial for diagnosis.
- The developed approach reduces hip implant artifacts.
- Enables better visualization of prostate and surrounding tissues for detecting cancerous and benign changes.
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