title: Initial clinical experience with a quadrupole butterfly coil for spinal injection interventions in an open MRI system at 1.0 tesla.
abstract: OBJECTIVE
  To report our initial clinical experience with a new magnetic resonance imaging (MRI) quadrupole coil that allows interventions in prone position.
  
  
  METHODS
  Fifteen patients (seven women, eight men; average age, 42.8 years) were treated in the same 1.0-Tesla Panorama High Field Open (HFO) MRI system (Panorama HFO) using a quadrupole butterfly coil (Bfly) and compared with 15 patients matched for sex, age, and MR intervention using the MultiPurposeL coil (MPL), performed in conventional lateral decubitus position (all, Philips Medical Systems, Best, The Netherlands). All interventions were performed with a near-real-time proton density turbo spin echo (PD TSE) sequence (time to repeat/time to echo/flip angle/acquisition time, 600 ms/10 ms/90°/3 s/image). Qualitative and quantitative image analyses were performed, including signal intensity, signal-to-noise and contrast-to-noise ratio (SNR, CNR), contrast, and full width at half maximum (FWHM) measurements.
  
  
  RESULTS
  Contrast differed significantly between the needle and muscles (Bfly 0.27/MPL 0.17), as well as the needle and periradicular fat (0.13/0.24) during the intervention (both, p=0.029), as well as the CNR between muscles and the needle (10.61/5.23; p=0.010), although the FWHM values did not (2.4/2.2; p=0.754). The signal intensity of the needle in interventional imaging (1152.9/793.2; p=0.006) and the postinterventional SNR values of subcutaneous fat (15.3/28.6; p=0.007), muscles (6.6/11.8; p=0.011), and the CNR between these tissues (8.7/17.5; p=0.004) yielded significant differences.
  
  
  CONCLUSIONS
  The new coil is a valid alternative for MR-guided interventions in an open MRI system at 1.0 tesla, especially if patients cannot (or prefer not to) be in a lateral decubitus position or if prone positioning yields better access to the target zone.
authors.forename: Martin
authors.initials: M
authors.lastname: Jonczyk
authors.forename: Bernd
authors.initials: B
authors.lastname: Hamm
authors.forename: Andreas
authors.initials: A
authors.lastname: Heinrich
authors.forename: Andreas
authors.initials: A
authors.lastname: Thomas
authors.forename: Hendrik
authors.initials: H
authors.lastname: Rathke
authors.forename: Bernhard
authors.initials: B
authors.lastname: Schnackenburg
authors.forename: Felix
authors.initials: F
authors.lastname: Güttler
authors.forename: Ulf K M
authors.initials: UK
authors.lastname: Teichgräber
authors.forename: Maximilian
authors.initials: M
authors.lastname: de Bucourt
mesh_terms: D000328:Adult; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005260:Female; D006801:Humans; D007278:Injections, Spinal / Q000295:instrumentation*; D053783:Magnetic Resonance Imaging, Interventional / Q000295:instrumentation*; D008280:Magnetics / Q000295:instrumentation*; D008297:Male; D010865:Pilot Projects; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity