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.

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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

Elastography Definition Motivation Basic principles Early experiments and images Contemporary results Future directions

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. JO 6/97

Elastography Definition Motivation Basic principles Early experiments and images Contemporary results Future directions

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 isoechoic, and hence difficult to detect by ultrasound.

Elastography Definition Motivation Basic data and principles Early experiments and images Contemporary results Future directions

Basic data on breast tissues data courtesy of Dr. T. Krouskop, Baylor College of medicine JO 1/98

Basic Principles: Normal strain

One Dimensional Uniform Spring System

Strain Profile in Uniform Spring strainstrain Depth

One Dimensional Non-Uniform Spring System

Strain Profile in Non-uniform Spring strainstrain Depth

Basic Principles: Tissue Compression Model Two-dimensional representation/ perfect-slip conditions 5/98 Before compression After compression

Elastography data acquisition system

Basic Principles: The Elastography Process Pre-compression RF A-lines Post-compression RF A-lines Applied Stress Theoretical Stress Distribution Local Cross Correlation Analysis Absolute Axial Stress Estimation ELASTOGRAM ESTIMATION OF STRAINESTIMATION OF STRESS

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)

Basic Principles: Estimation of Strain Pre-compression RF line Post-compression RF line del(t) (T) Strain=del(t)/ (T)

Elastography Definition Motivation Basic principles Early experiments and images Contemporary results Future directions

Layered foam phantom (ca.1991) photograph sonogram elastogram

Sponge w/ diagonal cut (ca. 1991) sonogram elastogram II photograph elastogram I

Breast carcinoma in vitro (ca. 1992) sonogram elastogram

Breast Carcinoma in-vivo (ca. 1993)

Elastography Definition Motivation Basic principles Early experiments and images Contemporary results Future directions

Elastogram from an ovine kidney SonogramPhotographElastogram

Ovine Kidneys in-vitro (1997) Two longitudinal elastographic views at 5 MHz 4/98

IEEE TRANSACTIONS ON ULTRASONICS, FERROELECTRICS, AND FREQUENCY CONTROL July 1998 Volume 45 Number 4 ITUCER (ISSN )

Canine prostate in-vitro (1998) Transverse slice ElastogramPhotographSonogram 9/98

MRI, Elastogram, Sonogram and Pathology Images from a Canine Prostate at 5 MHz (1999)

1 cm Canine Prostate in 5 MHz Trans. Long.

Infiltrating Ductal Carcinoma of the Breast sonogram (1996) elastogram

Invasive Ductal Carcinoma (1996) 1996 Sonogram Elastogram

Multifocal Breast Cancer in-vivo (1998) SonogramElastogram 2/98

Infiltrating Ductal Carcinoma of the Breast In Vivo at 5 MHz (1999)

Breast tumors in-vivo (1999) Fibroadenoma Infil. Duct. Carcinoma SonogramsElastograms

HIFU lesion in Canine Liver elastogramT2 MRI SonogramPathology

Elastography Definition Motivation Basic principles Early experiments and images Contemporary results Future directions

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.

Elastography: Block Diagram JO 6/98