Authors: Jurgen Fripp, Stuart Crozier, Simon K Warfield, S ´ebastien Ourselin Source: PHYSICS IN MEDICINE AND BIOLOGY 52 (2007) 1617– 1631 Speaker: Yi-Chun Ke Adviser: Bo-Chi Lai Ku-Yaw Chang
Transcript
Slide 1
Authors: Jurgen Fripp, Stuart Crozier, Simon K Warfield,
Sebastien Ourselin Source: PHYSICS IN MEDICINE AND BIOLOGY 52
(2007) 16171631 Speaker: Yi-Chun Ke Adviser: Bo-Chi Lai Ku-Yaw
Chang
Introduction Osteoarthritis (OA) Characterized changes in the
structure degeneration of the cartilage tissue Magnetic Resonance
Imaging(MRI ) non-invasively 2009/4/282 patella adipose tissue
tibia femur muscle tissue
Slide 4
Method point distribution model (PDM) 3D-statistical shape
models (3D-SSM) 3D-active shape model(3D-ASM) Dice similarity
coefficient(DSC) 2009/4/283
Slide 5
Method point distribution model (PDM) 3D-statistical shape
models (3D-SSM) 3D-active shape model(3D-ASM) Dice similarity
coefficient(DSC) 2009/4/284
Slide 6
Method point distribution model (PDM) Landmarking and obtaining
correspondence Represent the shape of the bones 2009/4/285
Slide 7
Method point distribution model (PDM) 3D-statistical shape
models (3D-SSM) 3D-active shape model(3D-ASM) Dice similarity
coefficient(DSC) 2009/4/286
Slide 8
Method 3D-statistical shape models (3D-SSM) estimate the pose
and shape individual SSM of each of the bones (patella, tibia and
femur) combined knee SSM 2009/4/287 Affine
Slide 9
Method point distribution model (PDM) 3D-statistical shape
models (3D-SSM) 3D-active shape model(3D-ASM) Dice similarity
coefficient(DSC) 2009/4/288
Slide 10
Method 3D-active shape model(3D-ASM) two components SSM
matching criteria (often an appearance model) two steps Deformation
Shape restriction 2009/4/289
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Method shape constraints obtained from the small database are
overly restrictive Disabling shape constraints Replacing BCI >
95% 2009/4/2810 3D ASM relax
Slide 12
Method point distribution model (PDM) 3D-statistical shape
models (3D-SSM) 3D-active shape model(3D-ASM) Dice similarity
coefficient(DSC) 2009/4/2811
Slide 13
Method Dice similarity coefficient(DSC) sensitivity = T P /(T P
+ F N ) specificity = T N /(T N + F P ) Dice similarity coefficient
= 2T P /(2T P + F P + F N ) 2009/4/2812 TpTp FnFn FpFp TnTn
Slide 14
Results 2009/4/2813
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Results 2009/4/2814
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Conclusion automatically segment the bones and accurately
extract the BCI each segmentation taking approximately 20 min DSC
of 0.96,0.96 and 0.89 (femur, tibia and patella) only 3.60% failing
approach for automatic use in subsequent cartilage segmentation and
quantitative analysis 2009/4/2815
Slide 17
, , , ,2009 , , , ,2008 Jurgen Fripp, Stuart Crozier, Simon K
Warfield, Sebastien Ourselin, PHYSICS IN MEDICINE AND
BIOLOGY,52,2007,16171631 MRI
http://www.cbshow.org.tw/internet/activity/mri/
http://www2.cmu.edu.tw/~anatomy/ctanatomy/MRI/index.html
http://www.mobile01.com/topicdetail.php?f=311&t=468552 Shape
Model Formulation http://www2.imm.dtu.dk/%7Eaam/main/node12.html
2009/4/2816