Outlines requirements and time The Imaging modalities 5 Radiography (XR.Plain Films) raphy (US) (MR) (DSA) ommunication System(PACS) X-Rays 15 Defined:The use of high-energy electromagnetic waves,passing through the body onto a photographic film,to producea picture of the internal structures of the body for diagnosis and herapy Properties ofX-rays 20 aphic effect ogical effec X-Rays High-energy electromagnetic waves an visible light Able topenetrate varying densities Much the xposing aph Imaging Principle of X-rays X-rays pass through tissue to expose film ●Passage depends: s/gram Energy of the Radiation Imaging Principle of X-ray When X-rays traverse through the body,different tissues absorb different amounts of The differential absorption of tissues is the cardinal feature of x-ray image formation2 Outlines, requirements and time allocation . The Imaging modalities ⚫ Radiography (XR, Plain Films) ⚫ Ultrasonography (US) ⚫ Computed Tomography (CT) ⚫ Magnetic Resonance Imaging (MR) ⚫ Digital Subtraction of Angiography (DSA) ⚫ Nuclear Medicine (PET) ⚫ Picture Archiving and Communication System (PACS ) X-Rays Defined:The use of high-energy electromagnetic waves, passing through the body onto a photographic film, to produce a picture of the internal structures of the body for diagnosis and therapy Properties of X-rays ⚫ Penetration ⚫ Fluorescent effect ⚫ Photographic effect ⚫ Ionizing effect ⚫ Biological effect X-Rays ⚫ High-energy electromagnetic waves ⚫ Travel in straight lines ⚫ Shorter wave length than visible light ⚫ Able to penetrate solid materials of varying densities ⚫ Capable of exposing a photographic plate (x-ray film) Much the same way as a camera exposes film Imaging Principle of X-rays ⚫ X-rays pass through tissue to expose film ⚫ Passage depends: Tissue Character Density Atomic number Number of electrons/gram Thickness (scatter) Energy of the Radiation Imaging Principle of X-ray ⚫ When X-rays traverse through the body, different tissues absorb different amounts of X-rays. ⚫ The unabsorbed X-rays get through to expose the X-ray film and create the image (photographic effect). The differential absorption of tissues is the cardinal feature of x-ray image formation 5’ 15’ 20