title: MR imaging of the female pelvis at 3 Tesla: evaluation of image homogeneity using different dielectric pads.
abstract: OBJECTIVE
  To evaluate improvements in image homogeneity in pelvic MR imaging at 3 Tesla (T) using two different dielectric pads.
  
  
  METHODS
  A total of eight healthy females were scanned using a 3T MR scanner equipped with a body-array coil. Axial and sagittal fast spin-echo T2-weighted images (T2WI) (TR/TE = 3200 msec/94 msec), axial fast spin-echo T1-weighted images (T1WI) (TR/TE = 700 msec/11 msec), and sagittal half-Fourier acquisition single-shot turbo spin-echo (HASTE) images (TR/TE = 3000 msec/100 msec) were performed for pelvic imaging. Sequences were repeated with dielectric pads (consisting of either ultrasound [US] gel or water), and without pads. Three or four regions of interest (ROIs) were placed on fatty tissues and the ratio of minimum to maximum signal intensity (RSI) was calculated as a marker of image homogeneity.
  
  
  RESULTS
  RSI was significantly higher on T2WI and T1WI when using dielectric pads than when no pad was used. A similar tendency was observed in RSI on HASTE. No significant difference was found between images with US gel pads and those with water pads.
  
  
  CONCLUSIONS
  Dielectric pads consisting of either US gel or water are effective in improving image homogeneity of the pelvis on 3T MRI.
authors.affiliation: Department of Diagnostic Imaging and Nuclear Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan. makok@kuhp.kyoto-u.ac.jp
authors.forename: Masako
authors.initials: M
authors.lastname: Kataoka
authors.forename: Hiroyoshi
authors.initials: H
authors.lastname: Isoda
authors.forename: Yoji
authors.initials: Y
authors.lastname: Maetani
authors.forename: Yuji
authors.initials: Y
authors.lastname: Nakamoto
authors.forename: Takashi
authors.initials: T
authors.lastname: Koyama
authors.forename: Shigeaki
authors.initials: S
authors.lastname: Umeoka
authors.forename: Ken
authors.initials: K
authors.lastname: Tamai
authors.forename: Aki
authors.initials: A
authors.lastname: Kido
authors.forename: Nobuko
authors.initials: N
authors.lastname: Morisawa
authors.forename: Tsuneo
authors.initials: T
authors.lastname: Saga
authors.forename: Kaori
authors.initials: K
authors.lastname: Togashi
mesh_terms: D000328:Adult; D002712:Chlorides; D003287:Contrast Media; D005260:Female; D019786:Gadolinium DTPA; D005782:Gels; D006801:Humans; D007089:Image Enhancement / Q000295:instrumentation*; D008279:Magnetic Resonance Imaging / Q000295:instrumentation*; D017895:Manganese Compounds; D010388:Pelvis / Q000033:anatomy & histology*
chemical_list: D002712:Chlorides; D003287:Contrast Media; D005782:Gels; D017895:Manganese Compounds; D019786:Gadolinium DTPA; C025340:manganese chloride