Chemical-shift MR imaging of the femoral head: an in vitro study of normal hips and hips with avascular necrosis.

Chemical-shift MR imaging of the femoral head: an in vitro study of normal hips and hips with avascular necrosis. Research Abstract Details 

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Chemical-shift MR imaging of the femoral head: an in vitro study of normal hips and hips with avascular necrosis. Abstract Text:

D G Mitchell,P M Joseph,M Fallon,W Hickey,H Y Kressel,V M Rao,M E Steinberg,M K Dalinka,

To study the conventional and chemical-shift MR images of fatty, hemopoietic, and ischemic bone marrow, four normal femurs from autopsies and six femoral heads from total hip replacement done for avascular necrosis (AVN) were imaged with a small-bore 1.4-T MR unit. T1- and T2-weighted spin-echo images, fat- and water-selective spin-echo images, and out-of-phase images were obtained. The specimens were then sectioned, radiographed, and studied histologically. The capital epiphysis and greater trochanter in normal femurs had the highest signal on T1-weighted, fat-selective, and out-of-phase images owing to their high fat content. Fat-selective and water-selective images accurately depicted regions of fat and water, whereas T1-weighted, T2-weighted, and out-of-phase images were misleading in some cases. On T2-weighted images, a double line consisting of a rim of low signal with a high-signal inner border was noted surrounding AVN lesions. Histologic correlation showed that the low-signal outer rim was due to sclerotic bone, while the high-intensity inner border was due to granulation tissue and/or chondroid metaplasia. Fractures within the six AVN lesions were best seen on T2-weighted images, but these could not be distinguished from granulation tissue. On T2-weighted images, the weight-bearing cartilage had lower signal in five of six femoral heads with AVN. We conclude that the MR appearance of AVN reflects its complex histopathology. Direct spin-echo chemical-shift imaging can help correlate MR images with histology by providing information not available from conventional or out-of-phase images.

Chemical-shift MR imaging of the femoral head: an in vitro study of normal hips and hips with avascular necrosis. Publishing Authors By Initials

DG Mitchell,PM Joseph,M Fallon,W Hickey,HY Kressel,VM Rao,ME Steinberg,MK Dalinka,

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Chemical-shift MR imaging of the femoral head: an in vitro study of normal hips and hips with avascular necrosis. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: AJR. American journal of roentgenology

VOLUME: 148

Page Numbers: 1159-64

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ISSN: 0361-803X

DAY: 15

MONTH: Jun

YEAR: 1987

Chemical-shift MR imaging of the femoral head: an in vitro study of normal hips and hips with avascular necrosis. Information

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LANGUAGE: eng

NlmUniqueID: 7708173

Chemical-shift MR imaging of the femoral head: an in vitro study of normal hips and hips with avascular necrosis. Keywords Mesh Terms:

KEYWORDS: Middle Aged

MESH TERMS: diagnostic use

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Country: UNITED STATES

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