Elastografie. Jan Kybic, J.Ophir 1,... January 9, mainslideshow/main_slide_show.pps. 1
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1 Elastografie Jan Kybic, J.Ophir 1,... January 9, mainslideshow/main_slide_show.pps
2 Elastography: Imaging of Tissue Elastic Properties In-Vitro and In-Vivo J. Ophir, B. Garra*, F. Kallel, E.E. Konofagou, R. Righetti** and T. Varghese The University of Texas Medical School, Houston, TX *The University of Vermont Medical Center, Burlington, VT **The University of Florence, Italy Supported by National Cancer Institute (NCI) Program Project Grant P01-CA 64597
3 Elastography Definition Motivation Basic principles Early experiments and images Contemporary results Future directions
4 JO 6/97 Definition Elastography: An imaging technique whereby local axial tissue strains are estimated from differential ultrasonic speckle displacements. These displacements are generated by a weak, quasi-static stress field. The resultant strain image is called an Elastogram.
5 Elastography Definition Motivation Basic principles Early experiments and images Contemporary results Future directions
6 Motivation *Most pathological changes are associated with changes in tissue stiffness. *Palpation is an effective method for lesion detection and evaluation. *Many cancers (breast, prostate) are iso-echoic, and hence difficult to detect by ultrasound.
7 Elastography Definition Motivation Basic data and principles Early experiments and images Contemporary results Future directions
8 Tissue Type Basic data on breast tissues Tissue Stiffness (kpa) 5% precompression 20% precompression Strain rate Strain rate 1%/sec 10%/sec 40%/sec 2%/sec 20%/sec 80%/sec Normal fat (n=40) 18 ± 7 19 ± 7 22 ± 9 20 ± 8 20 ± 6 23 ± 5 Normal glandular (n=31) 28 ± ± ± ± ± ± 17 Fibrous (n=21) 97 ± ± ± ± ± ± 83 Ductal tumor (n=23) 22 ± 8 25 ± 4 26 ± ± ± ± 78 Infilt.ductal tumor (n=32) 106 ± ± ± ± ± ± 178 JO 1/98 data courtesy of Dr. T. Krouskop, Baylor College of medicine
9 Basic Principles: Normal strain
10 One Dimensional Uniform Spring System
11 Strain Profile in Uniform Spring s t r a i n Depth
12 One Dimensional Non-Uniform Spring System
13 Strain Profile in Non-uniform Spring s t r a i n Depth
14 Basic Principles: Tissue Compression Model Two-dimensional representation/ perfect-slip conditions 5/98 Before compression After compression
15 Elastography data acquisition system
16 Basic Principles: The Elastography Process ESTIMATION OF STRAIN ESTIMATION OF STRESS Post-compression RF A-lines Pre-compression RF A-lines Applied Stress Theoretical Stress Distribution Local Cross Correlation Analysis Y local Stress Strain¹ Absolute Axial Stress Estimation local ELASTOGRAM
17 RF signal compression: 2% applied strain precomp postcomp Notice that a small compression (strain) of the tissue results in a small compression of the signal (similar to frequency modulation)
18 Basic Principles: Estimation of Strain Pre-compression RF line (T) del(t) Post-compression RF line Strain=del(t)/ (T)
19 Elastography Definition Motivation Basic principles Early experiments and images Contemporary results Future directions
20 Layered foam phantom (ca.1991) photograph sonogram elastogram
21 Sponge w/ diagonal cut (ca. 1991) photograph sonogram elastogram I elastogram II
22 Breast carcinoma in vitro (ca. 1992) sonogram elastogram
23 Breast Carcinoma in-vivo (ca. 1993)
24 Elastography Definition Motivation Basic principles Early experiments and images Contemporary results Future directions
25
26 Elastogram from an ovine kidney Sonogram Elastogram Photograph
27 4/98 Ovine Kidneys in-vitro (1997) Two longitudinal elastographic views at 5 MHz
28 IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL July 1998 Volume 45 Number 4 ITUCER (ISSN )
29 Canine prostate in-vitro (1998) Transverse slice Elastogram Photograph Sonogram 9/98
30 MRI, Elastogram, Sonogram and Pathology Images from a Canine Prostate at 5 MHz (1999)
31 Canine Prostate in 5 MHz 1 cm Trans. Long.
32 Infiltrating Ductal Carcinoma of the Breast sonogram (1996) elastogram
33 Invasive Ductal Carcinoma (1996) 1996 Sonogram Elastogram
34 Multifocal Breast Cancer in-vivo (1998) 2/98 Sonogram Elastogram
35 Infiltrating Ductal Carcinoma of the Breast In Vivo at 5 MHz (1999)
36 Breast tumors in-vivo (1999) Fibroadenoma Sonograms Elastograms Infil. Duct. Carcinoma
37 HIFU lesion in Canine Liver elastogram T2 MRI Sonogram Pathology
38 Elastography Definition Motivation Basic principles Early experiments and images Contemporary results Future directions
39 Conclusions and Future Directions Elastography conveys new and probably clinically important tissue information; The tradeoffs among engineering/elastographic image parameters are now reasonably well understood; Elastography can operate in hypoechoic areas (ex. shadows); Reliable small elastic contrast exists among normal soft-tissue components; good CNR allows its visualization; Pathology generally exhibits large elastic contrast; Promising areas include breast, prostate, vasculature, small parts and treatment monitoring.
40 Elastography: Block Diagram THEORY of ELASTICITY TISSUE MODULUS DISTRIBUTION modulus>>strain THEORY of ELASTICITY modulus>strain (dependence on boundary cond.) STRAIN FILTER STRAIN ELASTOGRAM ACOUSTIC, SIGNAL & PROCESSING PARAMETERS MODULUS ELASTOGRAM INVERSE PROBLEM SOLUTION strain>modulus JO 6/98 BOUNDARY CONDITIONS
41 Sonoelastogram Hitachi
42 Alternativní elastografické techniky
43 Buzení Excitace Kvazistatické (pomalé), tlakem sondy Impulsní Harmonické Mechanicky Interferencí ultrazvukových paprsků
44 Snímání Ultrazvuk Laserový vibrometr (interferometr) MRI + 3D data
45 Materiály s různou tuhostí. Fantom
46 Harmonické buzení MRI snímání Tužší hmota rychlejší vlnění
47 Harmonické buzení MRI snímání Tužší hmota rychlejší vlnění
48 Harmonické buzení MRI snímání Tužší hmota rychlejší vlnění
49 Harmonické buzení MRI snímání Tužší hmota rychlejší vlnění
50 Harmonické buzení MRI snímání Tužší hmota rychlejší vlnění
51 Harmonické buzení MRI snímání Tužší hmota rychlejší vlnění
52 Harmonické buzení MRI snímání Tužší hmota rychlejší vlnění
53 Harmonické buzení MRI snímání Tužší hmota rychlejší vlnění
54 Harmonické buzení MRI snímání Tužší hmota rychlejší vlnění
55 Harmonické buzení MRI snímání Tužší hmota rychlejší vlnění
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57 Harmonické buzení MRI snímání Tužší hmota rychlejší vlnění
58 Harmonické buzení MRI snímání Tužší hmota rychlejší vlnění
59 Harmonické buzení MRI snímání Tužší hmota rychlejší vlnění
60 Harmonické buzení MRI snímání Tužší hmota rychlejší vlnění
61 Harmonické buzení MRI snímání Tužší hmota rychlejší vlnění
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138 Elastografie závěr Neinvazivní metody měření elastických parametrů in vivo Tuhost často koreluje s diagnózou; klinické využití v bĺızké budoucnosti Technicky náročná řešení, specializovaný hardware Jednodušší snímání složitý inverzní problém
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