CT SPECIAL APPLICATIONS

CT ANGIOGRAPHY

CT IMAGE OF THE BLOOD VESSEL OPACIFIED BY

CONTRAST

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

CONTRAST ADMINISTERED WITH POWER INJECTOR

POWER INJECTOR PARAMETERS

VOLUME OF CONTRAST-ml

RATE ml/sec

TIME OF INJECTION – sec

SCAN DELAY TIME - sec

CONTRAST WARMER

WHY???

CARE BOLUS

                                                                                            

ACQUSITION PARAMETERS

PE?

Circle of Willis

Circle of Willis?!

40 SEC

ABDOMINAL CTA

CTA - MPR

PLANE?

ABDOMINAL AND FEMORAL RUNOFF

CARDIAC CT

CARDIAC CT PROCEDURES

• CARDIAC ANGIOGRAM

• CALCIUM SCORING

CALCIUM SCORING

NO IV CONTRAST USED

CALCIUM SCORING

CARDIAC ANGIOGRAMPERFORMED WITH CONTRAST

INJECTION

4-5 cc/sec

150 cc total volume

CARDIAC ANGIOGRAM

CINE CTA

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

COLONOSCOPY

BRONCHOSCOPY

                                                 

                  

VENTRICULOSCOPY

CORONARY ENDOSCOPY

HYSTERO-SALPINGOSCOPY

SPINAL CANAL SCOPE

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.

CT FLUORO

CONVENTIONAL CT LIMITATION

• LACK OF REAL TIME IMAGE DISPLAY

DATA COLLECTION IMAGE RECON

LAG!!

FUNDAMENTAL PRINCIPLES OF REAL TIME IMAGING

• FAST CONTINUOUS SCANNING

• FAST IMAGE RECONSTRUCTION

• CONTINUOUS IMAGE DISPLAY

RADIATION TREATMENT

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

• MEASUREMENT OF MINERAL CONTENT OF TRABECULAR BONE IN OSTEOPOROSIS

BMD

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 CT

• INHALATION OF XENON GAS.

XENON CT

Z # 54

XENON- IDEAL GAS FOR STUDYING BRAIN FUNCTION AND CEREBRAL

BLOOD FLOW • HIGH Z# - HIGH ATTENUATION

• HIGH FAT SOLUBILITY

• ABILITY TO CROSS BLOOD BRAIN BARRIER

XENON CT

• USEFUL IN EVALUATING REGIONAL PERFUSION IN CEREBROVASCULAR DISEASE AND STUDYING BRAIN METABOLISM.

• CLINICAL ROLE IN STUDYING:

DEMENTIA, SLEEP DISORDERS, MIGRANES, AND EPILEPSY