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Segmentation of bones in magnetic resonance images of the wrist.

Włodarczyk J, Czaplicka K, Tabor Z, Wojciechowski W, Urbanik A - Int J Comput Assist Radiol Surg (2014)

Bottom Line: The automated segmentation results were compared with gold-standard manual segmentations using a few well-established metrics: area under ROC curve AUC, mean similarity MS and mean absolute distance MAD.The mean (standard deviation) values of AUC, MS and MAD were 0.97 (0.04), 0.93 (0.09) and 1.23 (0.28), respectively.The results of the present study demonstrate that automated segmentation of wrist bones is feasible.

View Article: PubMed Central - PubMed

Affiliation: Jagiellonian University, Reymonta 4, 30-059,  Krakow, Poland, justyna.wlodarczyk@uj.edu.pl.

ABSTRACT

Purpose: Rheumatoid arthritis (RA) is a disease characterized by progressive and irreversible destruction of bones and joints. According to current recommendations, magnetic resonance imaging (MRI) is used to asses three main signs of RA based on manual evaluation of MR images: synovitis, bone edema and bone erosions. The key feature of a future computer-assisted diagnostic system for evaluation RA lesions is accurate segmentation of 15 wrist bones. In the present paper, we focus on developing a wrist bones segmentation framework.

Method: The segmentation procedure consisted of three stages: segmentation of the distal parts of ulna and radius, segmentation of the proximal parts of metacarpal bones and segmentation of carpal bones. At every stage, markers of bones were determined first, using an atlas-based approach. Then, given markers of bones and a marker of background, a watershed from markers algorithm was applied to find the final segmentation.

Results: The MR data for 37 cases were analyzed. The automated segmentation results were compared with gold-standard manual segmentations using a few well-established metrics: area under ROC curve AUC, mean similarity MS and mean absolute distance MAD. The mean (standard deviation) values of AUC, MS and MAD were 0.97 (0.04), 0.93 (0.09) and 1.23 (0.28), respectively.

Conclusion: The results of the present study demonstrate that automated segmentation of wrist bones is feasible. The proposed algorithm can be the first stage for the detection of early lesions like bone edema or synovitis.

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Related in: MedlinePlus

Coronal slices from MR images of wrist: a an atlas image, b a sample image, c and atlas image registered atlas to a sample image, d atlas markers transformed to the space of the sample image
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Related In: Results  -  Collection


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Fig9: Coronal slices from MR images of wrist: a an atlas image, b a sample image, c and atlas image registered atlas to a sample image, d atlas markers transformed to the space of the sample image

Mentions: Watershed from marker segmentation of carpals followed by the final processing.


Segmentation of bones in magnetic resonance images of the wrist.

Włodarczyk J, Czaplicka K, Tabor Z, Wojciechowski W, Urbanik A - Int J Comput Assist Radiol Surg (2014)

Coronal slices from MR images of wrist: a an atlas image, b a sample image, c and atlas image registered atlas to a sample image, d atlas markers transformed to the space of the sample image
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4379414&req=5

Fig9: Coronal slices from MR images of wrist: a an atlas image, b a sample image, c and atlas image registered atlas to a sample image, d atlas markers transformed to the space of the sample image
Mentions: Watershed from marker segmentation of carpals followed by the final processing.

Bottom Line: The automated segmentation results were compared with gold-standard manual segmentations using a few well-established metrics: area under ROC curve AUC, mean similarity MS and mean absolute distance MAD.The mean (standard deviation) values of AUC, MS and MAD were 0.97 (0.04), 0.93 (0.09) and 1.23 (0.28), respectively.The results of the present study demonstrate that automated segmentation of wrist bones is feasible.

View Article: PubMed Central - PubMed

Affiliation: Jagiellonian University, Reymonta 4, 30-059,  Krakow, Poland, justyna.wlodarczyk@uj.edu.pl.

ABSTRACT

Purpose: Rheumatoid arthritis (RA) is a disease characterized by progressive and irreversible destruction of bones and joints. According to current recommendations, magnetic resonance imaging (MRI) is used to asses three main signs of RA based on manual evaluation of MR images: synovitis, bone edema and bone erosions. The key feature of a future computer-assisted diagnostic system for evaluation RA lesions is accurate segmentation of 15 wrist bones. In the present paper, we focus on developing a wrist bones segmentation framework.

Method: The segmentation procedure consisted of three stages: segmentation of the distal parts of ulna and radius, segmentation of the proximal parts of metacarpal bones and segmentation of carpal bones. At every stage, markers of bones were determined first, using an atlas-based approach. Then, given markers of bones and a marker of background, a watershed from markers algorithm was applied to find the final segmentation.

Results: The MR data for 37 cases were analyzed. The automated segmentation results were compared with gold-standard manual segmentations using a few well-established metrics: area under ROC curve AUC, mean similarity MS and mean absolute distance MAD. The mean (standard deviation) values of AUC, MS and MAD were 0.97 (0.04), 0.93 (0.09) and 1.23 (0.28), respectively.

Conclusion: The results of the present study demonstrate that automated segmentation of wrist bones is feasible. The proposed algorithm can be the first stage for the detection of early lesions like bone edema or synovitis.

Show MeSH
Related in: MedlinePlus