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Phosphorus-31 MR Spectroscopy in Pediatric Liver Transplant Recipients: A Noninvasive Assessment of Graft Status with Correlation with Liver Function Tests and Liver Biopsy

Winnie C. W. Chu1, Wynnie W. M. Lam1, Kim-hung Lee2, David K. W. Yeung3, Jennifer Sihoe2 and Chung-kwong Yeung2

1 Department of Diagnostic Radiology and Organ Imaging, Faculty of Medicine, The Chinese University of Hong Kong, Prince of Wales Hospital, Ngan Shing St., Shatin, Hong Kong SAR, China.
2 Department of Surgery, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong SAR, China.
3 Department of Clinical Oncology, Medical Physics Division, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong SAR, China.



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  		Fig. 1. —Axial T2-weighted fat-saturation MR image (TR/TE, 1,800/80) of 11-year-old girl with left lobe transplant shows location of volume of interest (white box) selected for phosphorus-31 MR spectroscopy placed in central region of graft liver.

 


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  		Fig. 2. —In vivo hepatic phosphorus-31 MR spectra of healthy 7-year-old girl as control subject (spectrum A), 8-year-old girl with good graft function after liver transplantation (spectrum B), and 11-year-old girl with chronic hepatitis after liver transplantation (spectrum C). Spectra A and B show similar spectral profile, but there is marked elevation in phosphomonoester (PME) resonance (arrow) in spectrum C. Pi = inorganic phosphate, PDE = phosphodiester, PCr = phosphocreatine, NTP = nucleotide triphosphate.

 

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