ct special applications. ct angiography ct image of the blood vessel opacified by contrast
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REQUIREMENTS FOR CTA
• PATIENT PREPARATION
• ACQUSITION PARAMETERS
• CONTRAST MEDIUM ADMINISTRATION
• POSTPROCESSING TECHNIQUES
PATIENT PREP.
• BUN 7-20 mg/dl
• CREAT.- 0.6 –1.2 mg/dl
• IODINE ALLERGY- STEROID THERAPY
• HYPERVENTILATION BEFORE EXAM FOR BETTER BREATHOLD
POWER INJECTOR PARAMETERS
VOLUME OF CONTRAST-ml
RATE ml/sec
TIME OF INJECTION – sec
SCAN DELAY TIME - sec
VIRTUAL ENDOSCOPY
• USE OF VIRTUAL REALITY CONCEPTS TO THE CREATION OF INNER VIEWS OF TUBULAR STRUCTURES
VIRTUAL ENDOSCOPE
GRAPHICS-BASED SOFTWARE USED FOR SIMULATING ENDOSCOPIC EXPLORATION
INSIDE A 3-D IMAGE
APPLICATION OF VIRTUAL ENDOSCOPY
• COLONOSCOPY
• BRONCHOSCOPY
• CHOLANGIOPANCREATOSCOPY
• SINUS ENDOSCOPY
• BLADDER
• SPINAL CANAL ENDOSCOPY
• VESSEL ENDOSCOPY- ANGIOSCOPY
• NEURONS
• UTERUS & FALLOPIAN TUBES
HYSTERO-SALPINGOSCOPY
DISADVANTAGE OF VIRTUAL ENDOSCOPY
• HIGH COST• LACK OF QUANTITATIVE DATA• INABILITY OF PERFORMANCE OF
REAL INTERVENTIONAL PROCEDURE WITHOUT REAL ENDOSCOPE
• NO INFO ON MUCOSAL SURFACE• IMAGE QUALITY LIMITED BY
RESOLUTION OF SYSTEM.
FUNDAMENTAL PRINCIPLES OF REAL TIME IMAGING
• FAST CONTINUOUS SCANNING
• FAST IMAGE RECONSTRUCTION
• CONTINUOUS IMAGE DISPLAY
The 65 cm variable field of viewdelivers 15 additional cm of visualcoverage, allowing clinicians tosee a patient’s entire anatomy,facilitating precise radiation therapyplanning
QUANTITATIVE CT - STEPS
SCOUT SLICE SELECTION AXIALIMAGES
AUTOMATIC CANTOUR TRACING
ROI
MEAN VALUE CALCULATIONROI VALUE
CONVERTED TO
BMD VALUE
GRAPHIC OUTPUT, GRAPH BMD vs AGE, COMPARISON PERFORMED
XENON- IDEAL GAS FOR STUDYING BRAIN FUNCTION AND CEREBRAL
BLOOD FLOW • HIGH Z# - HIGH ATTENUATION
• HIGH FAT SOLUBILITY
• ABILITY TO CROSS BLOOD BRAIN BARRIER