Application of 3D‐MR image registration to monitor diseases around the knee joint

Takao, Masaki; Sugano, Nobuhiko; Nishii, Takashi; Miki, Hirokazu; Koyama, Tsuyoshi; Masumoto, Jun; Sato, Yoshinobu; Tamura, Shinichi; Yoshikawa, Hideki

doi:10.1002/jmri.20435

Cited by 15 publications

(16 citation statements)

References 13 publications

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“…The total duration of 16-b value DW imaging with nine repetitions was 14 minutes. DW images were coregistered by using the normalized cross-correlation method to correct for any respiratory motion ( 33 ). The nine repetitions of the registered images were averaged prior to analysis.…”

Section: Methodsmentioning

confidence: 99%

Variability of Renal Apparent Diffusion Coefficients: Limitations of the Monoexponential Model for Diffusion Quantification

Zhang¹,

Sigmund²,

Chandarana³

et al. 2010

Radiology

160

143

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Purpose:To investigate whether variability in reported renal apparent diffusion coeffi cient (ADC ) values in literature can be explained by the use of different diffusion weightings ( b values) and the use of a monoexponential model to calculate ADC . Materials and Methods:This prospective study was approved by institutional review board and was HIPAA-compliant, and all subjects gave written informed consent. Diffusion-weighted (DW) imaging of the kidneys was performed in three healthy volunteers to generate reference diffusion decay curves. In a literature meta-analysis, the authors resampled the ref- Results:Signifi cant correlation was found between the reported and predicted ADC values for whole renal parenchyma ( R 2 = 0.50, P = .002), cortex ( R 2 = 0.87, P = .0002), and medulla ( R 2 = 0.61, P = .0129), indicating that most of the variability in reported ADC values arises from limitations of a monoexponential model and use of different b values. Conclusion:The use of a monoexponential function for DW imaging analysis and variably sampled diffusion weighting plays a substantial role in causing the variability in ADC of healthy kidneys. For maximum reliability in renal apparent diffusion coeffi cient quantifi cation, data for monoexponential analysis should be acquired at a fi xed set of b values or a biexponential model should be used.q RSNA, 2010

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Section: Methodsmentioning

confidence: 99%

Variability of Renal Apparent Diffusion Coefficients: Limitations of the Monoexponential Model for Diffusion Quantification

Zhang¹,

Sigmund²,

Chandarana³

et al. 2010

Radiology

160

143

View full text Add to dashboard Cite

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“…The accuracy of the alignment of images using this procedure has been shown to be to a fraction of a voxel (0.49 mm for the femur and 0.56 mm for the tibia). 32 Changes in lesion size were determined by two authors (MT, NS) on all contiguous pairs of matched coronal SPGR images. Lesion regression was defined as migration of a low-intensity band on SPGR images toward the center of the lesion.…”

Section: Methodsmentioning

confidence: 99%

“…32 Before image registration, the distal femur or proximal tibia was segmented on followup scans. These scans then were accurately registered to the baseline scans to obtain serial coronal reconstructed images corresponding to the baseline scans.…”

Section: Methodsmentioning

confidence: 99%

Spontaneous Regression of Steroid-related Osteonecrosis of the Knee

Takao¹,

Sugano²,

Nishii³

et al. 2006

Clinical Orthopaedics and Related Research

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It is unknown whether lesions of steroid-related osteonecrosis of the knee increase or decrease in size during the course of the disease after diagnosis. We sought to determine whether steroid-related osteonecrosis of the knee would have spontaneous changes in size, and if so, the factors affecting the change. We performed baseline and followup (minimum of 1 year) magnetic resonance imaging scans on 30 knees of 17 patients. We then used image registration techniques to match two sets of images. Lesion size change was evaluated on all contiguous pairs of matched magnetic resonance images. Fourteen Stage 1 (preradiographic stage) knees in seven patients showed spontaneous incomplete regression without subsequent collapse. These patients had early steroid-related lesions detected within 3 years after starting steroid treatment and all showed bilateral and multifocal involvement; lesion regression occurred regardless of location. The initial size and location of the lesions and discontinuing steroid administration did not seem to affect regression. Regression can occur in some patients with early steroid-related osteonecrosis of the knee, and the time between initiation of steroid treatment and its diagnosis might be the most significant predictive factor.

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“…2). 17 The superior, lateral, and posterior planes of the rectangular parallelepiped were in contact with the greater trochanter. The inferior plane was positioned 10 cm distal from the superior plane.…”

Section: Methodsmentioning

confidence: 99%

“…The accuracy of the alignment of images using this procedure is a fraction of a voxel (0.43 mm). 17 Change in lesion size was determined by the consensus of two authors on all contiguous pairs of matched coronal images. Regression of the lesion was defined as migration of the low-intensity band on SPGR images toward the center of the lesion.…”

Section: Methodsmentioning

confidence: 99%

Longitudinal quantitative evaluation of lesion size change in femoral head osteonecrosis using three‐dimensional magnetic resonance imaging and image registration

Takao

Sugano

Nishii

et al. 2006

Journal Orthopaedic Research

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It remains controversial whether some lesions of femoral head osteonecrosis regress during the natural course of the disease. With image registration, accurately matched image sets of the same subject can be acquired at different times. We applied image registration to evaluate lesion size change and assessed accuracy and usefulness compared to volume measurements and a conventional method. We also investigated whether lesions regress with this technique and with volume measurements. Baseline and 1 year minimum follow-up scans were conducted on 25 patients (31 hips) without radiological evidence of collapse. A three-dimensional (3D) spoiled gradient recalled echo sequence was used in the coronal direction (slice thickness ¼ 2 mm; slice pitch ¼ 1 mm). Size change was evaluated on all contiguous pairs of matched images after image registration. As a conventional method, coronal images (slice thickness ¼ 5 mm) were reconstructed, and size change was evaluated on the five representative coronal slices. Evaluation with the conventional method identified eight lesions with apparent reduction; assessments using image registration and volume measurements identified three lesions, all within a year of initial steroid treatment and remaining at ARCO stage I at follow up. Evaluation of lesion size change using image registration was comparable to volume measurements. Inaccurate estimation of lesion size change due to mismatching of slice planes can be excluded. We demonstrated that some early lesions detected less than a year after initial steroid treatment can show size reduction with image registration as well as with volume measurements. ß

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Application of 3D‐MR image registration to monitor diseases around the knee joint

Cited by 15 publications

References 13 publications

Variability of Renal Apparent Diffusion Coefficients: Limitations of the Monoexponential Model for Diffusion Quantification

Variability of Renal Apparent Diffusion Coefficients: Limitations of the Monoexponential Model for Diffusion Quantification

Spontaneous Regression of Steroid-related Osteonecrosis of the Knee

Longitudinal quantitative evaluation of lesion size change in femoral head osteonecrosis using three‐dimensional magnetic resonance imaging and image registration

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