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Benign prostatic hyperplasia: Evaluation of T 1 , T 2 , and microvascular characteristics with T 1 ‐weighted dynamic contrast‐enhanced MRI
Author(s) -
Kershaw Lucy E.,
Hutchinson Charles E.,
Buckley David L.
Publication year - 2009
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/jmri.21674
Subject(s) - reproducibility , prostate , dynamic contrast enhanced mri , nuclear medicine , magnetic resonance imaging , tracer , medicine , nuclear magnetic resonance , biomedical engineering , chemistry , radiology , physics , chromatography , cancer , nuclear physics
Purpose To evaluate microvascular and relaxation parameters of prostate and nearby muscle in patients with benign prostatic hyperplasia (BPH), and to examine measurement reproducibility. Materials and Methods In this prospective study, 13 patients with BPH were imaged twice prior to surgery. The imaging protocol included a three‐dimensional (3D) inversion‐recovery turbo field‐echo measurement of T 1 , a multiecho measurement of T 2 , and a high temporal resolution (1.5 seconds per volume) dynamic contrast‐enhanced (DCE) acquisition. The DCE data were analyzed using a distributed parameter tracer kinetics model to provide estimates of perfusion (F b ), extraction fraction (E), mean transit time (T c ), and extravascular‐extracellular volume (v e ) in both the central gland (CG) and the peripheral zone (PZ) of the prostate, and in nearby muscle. Precision of these estimates was calculated using a bootstrap technique and the reproducibility was evaluated using the within‐patient coefficient of variation (wCV). Results The microvascular parameters were estimated in the prostate with high precision; in particular, E, F b , and v e had median CVs of ≤6%, ≤4 %, and ≤5%, respectively. Reproducibilities of the T 1 and T 2 measurements were excellent (wCV ≤ 4%), and reproducibility of the other parameters reflected values seen in previous studies. Conclusion Microvascular and relaxation properties of BPH can be measured precisely with reproducibilities for a distributed parameter tracer kinetics model that are comparable to those for a simpler model. Measurements of T 1 and T 2 were highly reproducible. J. Magn. Reson. Imaging 2009;29:641–648. © 2009 Wiley‐Liss, Inc.