Advanced Biomedical Imaging
Dr. Azza HelalDr. Azza HelalA. Prof.A. Prof. of Medical Physics of Medical Physics
Faculty of MedicineFaculty of MedicineAlexandria UniversityAlexandria University
Lecture 2Lecture 2Overview & comparison of different Overview & comparison of different
imaging modalities imaging modalities
Comparison of different imaging Comparison of different imaging modalitiesmodalities
1. Projection views
2.2. Ionizing radiationIonizing radiation
3. Speed
4. Contrast resolution
1.1. Projection viewsProjection views
Limited visualization
Plain x ray & Isotope scan
Flexible imaging planes
Cross-section views CT & MRICT & MRI
Flexible imaging planes with MRI.
MRI angiography
2.2. Ionizing radiationIonizing radiation
Plain x - ray, CT & isotope scan
3. Speed 3. Speed
US Fast Plain x ray CT MRIIsotope scan Slow
4. Contrast4. Contrast
Plain X RayPlain X Ray
CTCTPhysical and electron densityPhysical and electron density
USUS Transmitting & receiving high Transmitting & receiving high frequency sound wavefrequency sound wave
Isotope scanIsotope scan Uptake of radioactive tracerUptake of radioactive tracer
MRIMRI
Transmitting & receiving radio-Transmitting & receiving radio-waves inside a high magnetic fieldwaves inside a high magnetic field
(Water concentration & Magnetic (Water concentration & Magnetic properties)properties)
Contrast resolutionContrast resolution
Plain x ray & CT reflect bone contrast
MRI reflects soft tissue contrast
Assignments Assignments
One student will be selected for assignmentOne student will be selected for assignment
Suggested ReadingsSuggested Readings
David Sutton’s RadiologyDavid Sutton’s Radiology
Physics for medical imaging by RF Fare & PJ Allisy-Physics for medical imaging by RF Fare & PJ Allisy-Roberts.Roberts.
QuestionsQuestions
1.1. Mention the advantages of MRI over CT?Mention the advantages of MRI over CT?
2.2. Enumerate the imaging modalities that use Enumerate the imaging modalities that use
ionising radiation? ionising radiation?
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