Role of periodically rotated overlapping parallel lines with enhanced reconstruction diffusion-weighted imaging in correcting distortion and evaluating head and neck masses using 3 T MRI

Clin Radiol. 2014 Apr;69(4):403-9. doi: 10.1016/j.crad.2013.11.011. Epub 2013 Dec 17.

Abstract

Aim: To investigate the role of periodically rotated overlapping parallel lines with enhanced reconstruction (PROPELLER) diffusion-weighted imaging (DWI) in correcting distortion and evaluating head and neck masses.

Materials and methods: Both PROPELLER and echo planar diffusion weighted imaging (EP-DWI) with different b values were performed using 3 T MRI in 50 patients with solid masses of the head and neck. Distortion severity of 50 masses with both DWI techniques and different b values was qualitatively scored and compared. The apparent diffusion coefficient (ADC) values of the 45 masses, in which the distortion scores with both DWI techniques were ≥2, were measured and calculated. The mean ADC value of each DWI sequence between benign and malignant masses was compared.

Results: The mean distortion scores of PROPELLER DWIs were significantly higher than EP-DWIs (3.87 versus 1.96, and 3.88 versus 2.00, with b values of 1000 and 500 s/mm(2), respectively, p < 0.001), indicating distortion of the mass on PROPELLER DWIs was much less than that on EP-DWIs. With either PROPELLER or EP-DWI, the mean ADC value of 24 malignant tumours was significantly lower than that of 21 benign masses (p < 0.001).

Conclusion: Severe distortion of head and neck masses can be reduced significantly using PROPELLER DWI. Moreover, PROPELLER DWI plays an important role in differentiating malignancies from benign masses.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adolescent
  • Adult
  • Aged
  • Child
  • China / epidemiology
  • Diffusion Magnetic Resonance Imaging*
  • Early Detection of Cancer
  • Echo-Planar Imaging*
  • Female
  • Head and Neck Neoplasms / diagnosis*
  • Head and Neck Neoplasms / epidemiology
  • Head and Neck Neoplasms / pathology
  • Humans
  • Image Enhancement
  • Image Processing, Computer-Assisted*
  • Male
  • Middle Aged
  • Phantoms, Imaging
  • Prospective Studies
  • Reproducibility of Results