myocardial torsion estimation with tagged-mri in the osirix platform

Albert Andaluz [CVC] Francesc Carreras [CCB,HSP]Cristina Santa-Marta [HGM]Debora Gil [CVC]

http://iam.cvc.uab.es

Myocardial torsion estimation withTagged-MRI in the OsiriX platform

[1] Rosset, A., Spadola, L., Ratib, O.: Osirix: an open- source software for navigating in multidimensional dicom images. J Digit Imaging 17(3) (Sep 2004) 205--16[2] Carreras, F., Garcia-Barnes, J., Gil, D., et Al: Left ventricular torsion and longitudinal shortening: two fundamental components of myocardial mechanics assessed by tagged cine-mri in normal subjects. Int J Cardiovasc Imaging (Feb 2011)

References

Torsion estimation

Why Osirix?

Validation

Why Tagged-MRI?Tagged-MRIWhy torsion?

Validation

OsiriX[1]

DOMAIN: manual segmentation of LV Boundaries at reference frame

"Designed by physicians for physicians"Myocardial torsion follows myocardial functionality

Tag-grid deformation reflects intramural motion

CHALLENGE: heterogeneous image quality

[CVC]: Computer Vision Center, UAB. Barcelona,Spain [HSP]: Hospital de Sant Pau. Barcelona, Spain[CCB]: Clinica Creu Blanca. Barcelona, Spain [HGM]: Hospital Gregorio Maranon, Dpt Fisica Matematica y de Fluidos, UNED.

Affiliations

Source # Seqs Healthy? Modality DeviceCCB 21 Yes SPAMM SiemensHSP 8 No CSPAMM PhilipsCCB 12 No SPAMM SiemensHGM 7 No SPAMM Philips

40,0

60,0

100,0

20,0

80,00,0

-2,0

4,0

6,0

8,0

2,0

0,0

Torsion

Base rotation

Apex rotation

%ES

degrees

Left Ventricle

MOTION : HPF ensures robust tracking wihout overestimating injured areas [2]

TORSION: difference in basal/mid and apex global rotation in the LV domain

...Boundary evolution

t=ref t=ref+1 t=ES

Harmonic Phase Flow

PLUGIN: deployed at Sant Pau in September 2011

Conclusions and future work

Similar torsion trends for SPAMM acquisitions. C-SPAMM sequences too noisy for motion extraction.We will focus on quality indicators for improved reliability

HGM HSPCCB

PROTOCOL: different acquisitions, healthy and pathological cases

Base

Apex AMT

Dicom Viewer

Open Source

Image Processing

Oversaturation overlays tags over material points

+ =

t=ref t=ref+1 t=ref+2

100101010101010101010101001010

(devcom icon (C) Devcom. http://www.devcom.com/)

Base ApexScores