Try a new search

Format these results:

Searched for:

in-biosketch:true

person:rechtm01

Total Results:

201


Postcontrast MR arthrography in assessment of cartilage lesions

Kramer, J; Recht, M P; Imhof, H; Stiglbauer, R; Engel, A
OBJECTIVE: Although MR has been proven effective in evaluating many components of the musculoskeletal system, including ligaments, fibrocartilage, muscle, and bone marrow, its role in the evaluation of articular cartilage remains controversial. Recent studies have demonstrated that intraarticular injection of Gd-DTPA [MR arthrography (MRA)] improves the detection of cartilage abnormalities in cadaveric specimens. The aim of this study was to determine the efficacy of MRA for the detection of naturally occurring cartilage lesions in a clinical population. MATERIALS AND METHODS: Sixty knees of 58 patients were studied with a three-dimensional (3D) T2*-weighted GE sequence (FISP) both before and after and a T1-weighted (T1W) SE sequence after the intraarticular injection of a 2 mmol/L Gd-DTPA solution. All knees subsequently underwent arthroscopy or arthrotomy. RESULTS: The MRA sequences performed significantly better (kappa = 0.85) than the routine FISP sequences (kappa = 0.39) in both the detection and the staging of cartilage abnormalities. The MRA FISP sequence (kappa = 0.91) performed slightly better than the MRA T1W sequence (kappa = 0.85), but there was no statistically significant difference between the two sequences. No complications from the intraarticular injection of contrast material occurred. CONCLUSION: Therefore, MRA appears to be an effective and safe method for the evaluation of articular cartilage abnormalities
PMID: 7510315
ISSN: 0363-8715
CID: 87109

Distribution of normal and abnormal fluid collections in the glenohumeral joint: implications for MR arthrography

Recht, M P; Kramer, J; Petersilge, C A; Yu, J; Pathria, M; Trudell, D; Sartoris, D J; Resnick, D
Although magnetic resonance (MR) images of the glenohumeral joint frequently demonstrate intraarticular fluid, no specific criteria have, to the authors' knowledge, been published that allow accurate assessment of the amount of fluid present. Also, despite the increasing use of MR arthrography of the shoulder, the optimal amount of intraarticular fluid that should be used with this technique has not been determined. The authors progressively distended the glenohumeral joint in six cadaveric shoulder specimens with a dilute gadopentetate dimeglumine solution and obtained MR images after injection of 2, 5, 10, 15, and 20 mL of the solution. The pattern of fluid distribution was evaluated, and these results were then used to estimate the amount of fluid that was present in the glenohumeral joint on MR images of 20 shoulders obtained in 12 asymptomatic volunteers. In 14 of these shoulders, intraarticular fluid was present; however, in none was more than 2 mL evident. Results of the cadaveric study also indicated that 15 mL of intraarticular fluid appears to be the optimal amount for MR arthrography
PMID: 8180457
ISSN: 1053-1807
CID: 87108

Isolated or dominant lesions of the patella in gout: a report of seven patients

Recht, M P; Seragini, F; Kramer, J; Dalinka, M K; Hurtgen, K; Resnick, D
Isolated or dominant osteolytic lesions of the patella are an unusual manifestation of gout. We present seven patients who had such patellar lesions unilaterally (six patients) or bilaterally (one patient) and analyze the radiologic characteristics to determine whether they can be differentiated from those of other osteolytic lesions of the patella. The lesions were uniformly characterized by a geographic pattern of bone destruction in the superolateral aspect of the patella. Five lesions were each accompanied by a peripatellar soft tissue mass, four of which contained calcification. It therefore appears that an osteolytic lesion of the superolateral portion of the patella, especially when associated with a peripatellar calcified soft tissue mass, should alert one to the possible diagnosis of gout. Awareness of this possibility may obviate the need for invasive diagnostic procedures
PMID: 8191294
ISSN: 0364-2348
CID: 87110

Magnetic resonance imaging studies of the shoulder: diagnosis of lesions of the rotator cuff

Recht, M P; Resnick, D
PMID: 9097178
ISSN: 0065-6895
CID: 87111

3-DIMENSIONAL IMAGE REGISTRATION USING ARTIFICIAL NEURAL NETWORKS

PIRAINO, D; KOTSAS, P; RICHMOND, B; RECHT, M; KORMOS, D
Registration of three-dimensional medical images is important for correlation of images from different modalities and to be able to follow progression or regression of disease. In this paper, the authors investigate the use of artificial neural networks in registering simulated 3-D images. Backpropagation networks with 0 or 1 hidden layers accurately map between coordinate spaces which are rotated, translated, and linearly scaled in 3 dimensions. Mapping between coordinate spaces which are nonlinear related is less accurate. Functional link net type architecture and larger training sets appear to improve the accuracy on these non-linear mappings
INSPEC:4923518
ISSN: 1098-7576
CID: 97836

MR and CT of musculoskeletal tumors

Chapter by: Gentili A; Recht MP
in: Computed tomography and magnetic resonance imaging of the whole body by Haaga JR [Eds]
St. Louis MO : Mosby, 1994
pp. 1407-1426
ISBN: 0801670578
CID: 4991

Imaging techniques of articular cartilage

Schils JP; Recht MP; Belhobek GH; Piraino DW; Richmond BJ
ORIGINAL:0006521
ISSN: 1062-8592
CID: 97851

Magnetic resonance-imaging studies of the shoulder. Diagnosis of lesions of the rotator cuff

Recht, M P; Resnick, D
PMID: 8354686
ISSN: 0021-9355
CID: 87112

MR appearance of idiopathic synovial osteochondromatosis

Kramer, J; Recht, M; Deely, D M; Schweitzer, M; Pathria, M N; Gentili, A; Greenway, G; Resnick, D
OBJECTIVE: A retrospective review of the MR examinations in 21 patients with idiopathic synovial osteochondromatosis (ISO) was performed to determine its MRI characteristics. MATERIALS AND METHODS: Twenty-one patients diagnosed with ISO had undergone MRI prior to surgery. The MR images were retrospectively evaluated for configuration and extent of lesion as well as for signal characteristics. RESULTS: Three distinct MR patterns were seen in ISO: A--lobulated homogeneous intraarticular signal isointense to slightly hyperintense to muscle on T1-weighted images and hyperintense on T2-weighted images (n = 3); B--pattern A plus foci of signal void on all pulse sequences (n = 17); and C--features of pattern A and B plus foci of peripheral low signal surrounding central fat-like signal (n = 2). The foci of signal void in pattern B and C corresponded to areas of calcification and the foci of peripheral low signal surrounding central fat-like signal in pattern C corresponded to areas of ossification. CONCLUSION: The MR appearance of ISO appears sufficiently unique to allow its differentiation from other causes of intraarticular pathology
PMID: 8370833
ISSN: 0363-8715
CID: 97829

Abnormalities of articular cartilage in the knee: analysis of available MR techniques

Recht, M P; Kramer, J; Marcelis, S; Pathria, M N; Trudell, D; Haghighi, P; Sartoris, D J; Resnick, D
In an attempt to improve the detection of chondral abnormalities with magnetic resonance imaging, a fat-suppressed three-dimensional gradient-recalled acquisition in the steady state (GRASS) and spoiled GRASS (SPGR) sequence was optimized by study of five cadaveric knee specimens. Results with this optimized sequence then were compared with results with three spin-echo (T1-, proton-density-, and T2-weighted) and two three-dimensional gradient-recalled echo sequences (GRASS and non-fat-suppressed SPGR) in the assessment of naturally occurring abnormalities of the patellofemoral compartment in 10 cadaveric knees. Results with the optimized fat-suppressed SPGR sequence were significantly better (P < .02) than results with the other five sequences and had a sensitivity of 96%, a specificity of 95%, and an accuracy of 95%. In addition, normal cartilage consistently appeared as a trilaminar structure with the fat-suppressed SPGR sequence, a feature that appeared to help in identification of chondral lesions
PMID: 8475293
ISSN: 0033-8419
CID: 87113