Improved detection of hepatic metastases from pancreatic cancer using periodically rotated overlapping parallel lines
Yuusuke Hirokawa1, Hiroyoshi Isoda, Tomohisa Okada
1Department of Radiology, Otsu Red Cross Hospital, Otsu-city, Shiga, Japan. yuusuke@kuhp.kyoto-u.ac.jp
Objectives:
The purpose of this study was to evaluate the detection of hepatic metastases from the pancreatic cancer using different MR imaging methods, including superparamagnetic iron oxide (SPIO)-enhanced fat-saturated T2-weighted imaging with periodically rotated overlapping parallel lines with enhanced reconstruction (PROPELLER) technique.
Materials And Methods:
The institutional review board approved this prospective study. Eighty-two patients (mean age, 55 years) underwent different MR imaging with a 1.5-T scanner. Diagnostic performance with receiver operating characteristics (ROC) curves and sensitivity were evaluated for the following image sets: (A) unenhanced images (T1-weighted in-phase and opposed-phase gradient-echo [GRE] images, and fat-saturated T2-weighted turbo spin-echo [TSE] images) that were included in the subsequent image sets, (B) diffusion-weighted images, (C) SPIO-enhanced fat-saturated T2-weighted TSE images with prospective acquisition correction (PACE), (D) SPIO-enhanced T2*-weighted GRE images, and (E) SPIO-enhanced fat-saturated T2-weighted TSE images acquired with PROPELLER and PACE.
Results:
The areas under the ROC curves were 0.58 +/- 0.05 (mean +/- standard errors), 0.81 +/- 0.04, 0.70 +/- 0.05, 0.80 +/- 0.04, and 0.90 +/- 0.03, and sensitivity was 0.47, 0.69, 0.56, 0.66, and 0.77 for image sets (A) to (E), respectively, for all lesions. Image set (E) had significantly larger area under the ROC curve for detection of hepatic lesions and higher sensitivity than others.
Conclusions:
SPIO-enhanced fat-saturated T2-weighted MR imaging with the PROPELLER technique is more effective for detecting hepatic metastases of pancreatic cancer than diffusion-weighted MR imaging, SPIO-enhanced fat-saturated T2WI without the PROPELLER technique, or SPIO-enhanced T2*-weighted GRE imaging.
Insights
Superparamagnetic iron oxide (SPIO)-enhanced T2-weighted MRI with the PROPELLER technique significantly improves the detection of pancreatic cancer hepatic metastases. This advanced MR imaging method offers higher sensitivity and accuracy compared to other techniques.
Area of Science:
- Radiology
- Oncology
- Medical Imaging
Background:
- Pancreatic cancer frequently metastasizes to the liver, posing a diagnostic challenge.
- Accurate detection of hepatic metastases is crucial for treatment planning and patient prognosis.
Purpose of the Study:
- To evaluate the efficacy of different magnetic resonance (MR) imaging techniques for detecting hepatic metastases from pancreatic cancer.
- Specifically, to compare superparamagnetic iron oxide (SPIO)-enhanced fat-saturated T2-weighted imaging with the periodically rotated overlapping parallel lines with enhanced reconstruction (PROPELLER) technique against other MR methods.
Main Methods:
- A prospective study involving 82 patients with pancreatic cancer using a 1.5-T MR scanner.
- Evaluated diagnostic performance using receiver operating characteristic (ROC) curves and sensitivity for five MR imaging sets: unenhanced, diffusion-weighted, SPIO-enhanced T2-weighted (PACE), SPIO-enhanced T2*-weighted GRE, and SPIO-enhanced T2-weighted with PROPELLER and PACE.
Main Results:
- The SPIO-enhanced T2-weighted MR imaging with PROPELLER and PACE (Image set E) achieved the highest area under the ROC curve (0.90 ± 0.03) and sensitivity (0.77).
- This technique demonstrated significantly superior performance in detecting hepatic lesions compared to unenhanced imaging, diffusion-weighted imaging, SPIO-enhanced T2-weighted (PACE), and SPIO-enhanced T2*-weighted GRE imaging.
Conclusions:
- SPIO-enhanced fat-saturated T2-weighted MR imaging utilizing the PROPELLER technique is highly effective for detecting hepatic metastases in pancreatic cancer patients.
- This advanced MR imaging approach surpasses the diagnostic capabilities of diffusion-weighted MR imaging and other SPIO-enhanced techniques for this specific clinical application.
