1 Seite 1 RUPRECHT-KARLS- UNIVERSITY HEIDELBERG Computer Assisted Clinical Medicine Prof. Dr. Lothar Schad 12/9/2008 | Page 1 Physics of Imaging Systems (ROE, CT, MRI) Prof. Dr. Lothar Schad Chair in Computer Assisted Clinical Medicine Faculty of Medicine Mannheim University of Heidelberg Theodor-Kutzer-Ufer 1-3 D-68167 Mannheim, Germany [email protected]www.ma.uni-heidelberg.de/inst/cbtm/ckm/ Master‘s Program in Medical Physics RUPRECHT-KARLS- UNIVERSITY HEIDELBERG Computer Assisted Clinical Medicine Prof. Dr. Lothar Schad 12/9/2008 | Page 2 www.ma.uni-heidelberg.de/inst/cbtm/ckm/
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RUPRECHT-KARLS-UNIVERSITY HEIDELBERG
Computer Assisted Clinical MedicineProf. Dr. Lothar Schad
12/9/2008 | Page 1
Physics of
Imaging Systems (ROE, CT, MRI)
Prof. Dr. Lothar Schad
Chair in Computer Assisted Clinical MedicineFaculty of Medicine Mannheim University of HeidelbergTheodor-Kutzer-Ufer 1-3D-68167 Mannheim, GermanyLothar.Schad@MedMa.Uni-Heidelberg.dewww.ma.uni-heidelberg.de/inst/cbtm/ckm/
Master‘s Program in Medical Physics
RUPRECHT-KARLS-UNIVERSITY HEIDELBERG
Computer Assisted Clinical MedicineProf. Dr. Lothar Schad
Computer Assisted Clinical MedicineProf. Dr. Lothar Schad
12/9/2008 | Page 12
To look into the object without cutting or destroying (non-invasively) !
Goal
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RUPRECHT-KARLS-UNIVERSITY HEIDELBERG
Computer Assisted Clinical MedicineProf. Dr. Lothar Schad
12/9/2008 | Page 13
definition:
• interaction of energy with biological tissue in order to get spatially resolved information about the physical properties of the underlying biological structure
• energy has to penetrate through the body for interaction (absorption, scattering, …)
interpretation of imaging information:
• importance of measured physical properties with respect to differentiate between normal and diseased tissue (pathology)
• not fully understood
Diagnostic Imaging: Definition
RUPRECHT-KARLS-UNIVERSITY HEIDELBERG
Computer Assisted Clinical MedicineProf. Dr. Lothar Schad
12/9/2008 | Page 14
different energies means different interaction with tissue
PET and MRI are at the end of the spectrum
ionizing non-ionizing
HzHz
Micro-Visible Infrared Milli-
meter waveand RF
THz gap
10 15Hz 10 14 Hz 10 13 10 12 10 11Hz 10 10Hz
Ultra-violet
10 16 Hz10 17Hz
magneticresonance
imagingMRI
nuclear medicine / PET
10 18Hz10 19Hz
X-ray / CTimaging
100keV 10keV
terahertz pulseimaging (TPI)
NIRF
Frequency
TV satellitedish
THz Gap
OCT
X-ray
Diagnostic Imaging: Electromagnetic Wave
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RUPRECHT-KARLS-UNIVERSITY HEIDELBERG
Computer Assisted Clinical MedicineProf. Dr. Lothar Schad
Computer Assisted Clinical MedicineProf. Dr. Lothar Schad
12/9/2008 | Page 16Bildgebende Verfahren
without ionizingradiation
with ionizingradiation
Nuclear MagneticResonance
Ultrasound X-rays Nuclear MedicalTechniques
spectroscopy(MRS)
tomography(MRI)
tomography(CT)
planar planar emissiontomography
(PET)
Diagnostic Imaging: Overview
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RUPRECHT-KARLS-UNIVERSITY HEIDELBERG
Computer Assisted Clinical MedicineProf. Dr. Lothar Schad
12/9/2008 | Page 17
image by courtesy of Helmut Newton
source: ECR Newsletter 4/2002
Diagnostic Imaging: Anatomy
RUPRECHT-KARLS-UNIVERSITY HEIDELBERG
Computer Assisted Clinical MedicineProf. Dr. Lothar Schad
12/9/2008 | Page 18Diagnostic Imaging: Pathology
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RUPRECHT-KARLS-UNIVERSITY HEIDELBERG
Computer Assisted Clinical MedicineProf. Dr. Lothar Schad
12/9/2008 | Page 19Diagnostic Imaging: Animals
RUPRECHT-KARLS-UNIVERSITY HEIDELBERG
Computer Assisted Clinical MedicineProf. Dr. Lothar Schad
12/9/2008 | Page 20
The brain shows a large, left posterior / temporal / parietal metastasis. In the transaxial views, a hyper-metabolic area, measuring 2.2 x 2.1 cm with a solid center, is seen, surrounded by edema (arrow on fused image details hypermetabolic area).
PET / CT
PET / MRI
Set-up of the McPET system inside the 1.5 T clinical scanner. McPET’s ring of detectors is placed inside the MRI coil (white arrow) and transmits its output to the MC-PMTs, enclosed in the RF-shielded box in the foreground, via doubleclad optical fibers (black arrow).
A pair of PET (a) and MR (b) images contemporaneously obtained from the C-phantom at 1.5 T.
source: GE Medical Systems Farahani et al. JMR 1999
Diagnostic Imaging: System Combination- anatomic / metabolic imaging
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RUPRECHT-KARLS-UNIVERSITY HEIDELBERG
Computer Assisted Clinical MedicineProf. Dr. Lothar Schad
12/9/2008 | Page 21
source: ECR Newsletter 4/2002
Biomedical Imaging
RUPRECHT-KARLS-UNIVERSITY HEIDELBERG
Computer Assisted Clinical MedicineProf. Dr. Lothar Schad
12/9/2008 | Page 22
• diagnostic
• therapy-planning and -monitoring
• screening
• monitoring of interventions
main focus of diagnostic imaging
Diagnostic Imaging: Field of Application
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RUPRECHT-KARLS-UNIVERSITY HEIDELBERG
Computer Assisted Clinical MedicineProf. Dr. Lothar Schad
12/9/2008 | Page 23
X-Ray CT MR US
imaging of bone soft tissue vessel function volume