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Updated: Jun 5, 2025
Registered Bioimaging of Nanomaterials for Diagnostic and Therapeutic Monitoring
Published on: December 9, 2010
Diffusion-weighted imaging of the head and neck: comparison between integrated slice-specific dynamic shimming and
Tong Su1, Xiaoli Zhu2, Yu Chen1
1Department of Radiology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China.
Integrated slice-specific dynamic shimming (iShim) with readout-segmented echo-planar imaging (RESOLVE) significantly reduces lesion distortion and enhances image quality for head and neck tumors compared to simultaneous multi-slice (SMS) RESOLVE. This iShim-RESOLVE technique shows promise for improved clinical assessment of head and neck lesions.
Area of Science:
- Radiology
- Medical Imaging
- Oncology
Background:
- Diffusion-weighted imaging (DWI) is crucial for assessing head and neck tumors.
- Traditional DWI techniques can suffer from geometric distortion and artifacts, particularly in the head and neck region.
- Improving image quality and reducing distortion are key for accurate diagnosis and treatment planning.
Purpose of the Study:
- To compare the performance of integrated slice-specific dynamic shimming (iShim) with simultaneous multi-slice (SMS) readout-segmented echo-planar imaging (RESOLVE) for DWI of malignant head and neck tumors.
- To evaluate subjective and quantitative image quality metrics, lesion distortion, apparent diffusion coefficient (ADC) values, and acquisition times.
Main Methods:
- A prospective study involving 45 patients with malignant head and neck lesions.
- Acquisition of DWI data using both iShim-RESOLVE and SMS-RESOLVE techniques at 3 Tesla with b-values of 0 and 800 s/mm².
- Comprehensive evaluation of subjective image quality, quantitative image distortion, signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR), SNR efficiency, ADC values, and scan times.
Main Results:
- iShim-RESOLVE (3 min 7 s) had longer acquisition times than SMS-RESOLVE (2 min 1 s).
- iShim-RESOLVE demonstrated significantly superior overall image quality, reduced geometric distortion, less signal loss, and better fat saturation compared to SMS-RESOLVE (P < .05).
- Quantitative tumor distortion was significantly smaller in iShim-RESOLVE images. SNR, CNR, and SNR efficiency were significantly higher with iShim-RESOLVE (P < .001), and ADC measurements showed excellent agreement.
Conclusions:
- iShim-RESOLVE significantly decreases lesion distortion and improves overall image quality in the head and neck region compared to SMS-RESOLVE.
- iShim-RESOLVE DWI is a promising technique for reducing distortion and enhancing the assessment of head and neck lesions in clinical practice.
