European Radiology

, Volume 17, Issue 4, pp 939–949

Screening for bone metastases: whole-body MRI using a 32-channel system versus dual-modality PET-CT

  • Gerwin P. Schmidt
  • Stefan O. Schoenberg
  • Rupert Schmid
  • Robert Stahl
  • Reinhold Tiling
  • Christoph R. Becker
  • Maximilian F. Reiser
  • Andrea Baur-Melnyk
Musculoskeletal

DOI: 10.1007/s00330-006-0361-8

Cite this article as:
Schmidt, G.P., Schoenberg, S.O., Schmid, R. et al. Eur Radiol (2007) 17: 939. doi:10.1007/s00330-006-0361-8

Abstract

The diagnostic accuracy of screening for bone metastases was evaluated using whole-body magnetic resonance imaging (WB-MRI) compared with combined fluorodeoxyglucose (FDG) positron emission tomography (PET) and computed tomography (CT) (FDG-PET-CT). In a prospective, blinded study, 30 consecutive patients (18 female, 12 male; 24–76 years) with different oncological diseases and suspected skeletal metastases underwent FDG-PET-CT as well as WB-MRI with the use of parallel imaging (PAT). With a 32-channel scanner, coronal imaging of the entire body and sagittal imaging of the complete spine was performed using T1-weighted and short tau inversion recovery (STIR) sequences in combination. PET-CT was conducted using a low-dose CT for attenuation correction, a PET-emission scan and diagnostic contrast-enhanced CT scan covering the thorax, abdomen and pelvis. Two radiologists read the MRI scans, another radiologist in combination with a nuclear medicine physician read the PET-CT scans, each in consensus. The standard of reference was constituted by radiological follow-up within at least 6 months. In 28 patients, 102 malignant and 25 benign bone lesions were detected and confirmed. WB-MRI showed a sensitivity of 94% (96/102), PET-CT exams achieved 78% (79/102; P<0.001). Specificities were 76% (19/25) for WB-MRI and 80% (20/25) for PET-CT (P>0.05). Diagnostic accuracy was 91% (115/127) and 78% (99/127; P<0.001), respectively. Cut-off size for the detection of malignant bone lesions was 2 mm for WB-MRI and 5 mm for PET-CT. WB-MRI revealed ten additional bone metastases due to the larger field of view. In conclusion, WB-MRI and FDG-PET-CT are robust imaging modalities for a systemic screening for metastatic bone disease. PAT allows WB-MRI bone marrow screening at high spatial resolution and with a diagnostic accuracy superior to PET-CT.

Keywords

Bone Metastases Magnetic resonance Computed tomography Positron emission tomography 

Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • Gerwin P. Schmidt
    • 1
  • Stefan O. Schoenberg
    • 1
  • Rupert Schmid
    • 2
  • Robert Stahl
    • 1
  • Reinhold Tiling
    • 2
  • Christoph R. Becker
    • 1
  • Maximilian F. Reiser
    • 1
  • Andrea Baur-Melnyk
    • 1
  1. 1.Department of Clinical RadiologyUniversity Hospitals Grosshadern, Ludwig-Maximilians-University MunichMünchenGermany
  2. 2.Department of Nuclear MedicineUniversity Hospitals Grosshadern, Ludwig-Maximilians-University MunichMünchenGermany

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