CT : AN OVER VIEW
Being a strong tool of imaging science Computed Tomography is always under developments. Recent advances in CT are mostly based on multi detectors which brings a more clearer path for cardiac CT.
AFTER A SERIES OF MULTISLICE CT SCANNERS COMPUTED TOMOGRAPHY IS NOW ON TURNING POINT. IT NOW EXPLORED A NEW TECHNOLOGY BY THE USE OF MULTI SOURCES FOR X-RAY PRODUCTION.
PRINCIPLE
A SINGLE SOURCE-DETECTOR COMBINATION HAS TO ROTATE 180 DEGREE TO OBTAIN IMAGE. THE DUAL SOURCE CT SCANNER USES TWO X-RAY TUBES WHICH ARE MOUNTED AT RIGHT ANGLES TO EACH OTHER. SO THE 180 DEGREE DATA IS SPLIT IN TO TWO SINOGRAMS.
SO EACH OF THE TWO SOURCE DATA COMBINATION ONLY NEEDS TO TRAVEL 90 DEGREES TO OBTAIN IMAGE.
SYSTEM SPECIFICATIONS
THE DUAL SOURCE CT SCANNER UTILISES TWO X-RAY SOURCES WHICH ARE MOUNTED RIGHT ANGLES TO EACH OTHER.
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ULTRA FAST CERAMIC DETECTORS ARE USED.
- THE RECONSTRUCTION ALGORITHMS ARE TOTALLY DIFFERENT FROM THE CONVENTIONAL METHODS USED IN THE CURRENT CT SCANNERS.
SOMATOM DEFINITION :
THE WORLD’S FIRST DUAL SOURCE CT SCANNER
SIEMENS MEDICAL INTRODUCES THE WORLDS FIRST DUAL SOURCE CT. THE FIRST INSTALLATION IN INDIA WAS IN BREACH CANDY HOSPITAL, MUMBAI.
APPLICATIONS
THE MAJOR APPLICATION OF DSCT COMES IN CARDIAC IMAGING.
UNLIKE MOST OTHER ORGANS HEART CAN BE REGARDED AS A MOVING TARGET. CONSIDERING A RAPID MOTION OF THE HEART AT ABOUT 70-75 BEATS PER SECOND WHEN RESTING. A SINGLE SOURCE CT SCANNER, EVEN A 64 SLICE CT SCANNER IS STILL TOO SLOW TO VISUALIZE THE HEART WITHOUT MOTION ARTIFACT.
USING MULTISLICE CT, PATIENTS WITH FAST IRREGULAR HEART BEATS ARE EXAMINED BY THE ADMINISTRATION OF BEETA BLOCKERS. SINCE THE DSCT HAS TO TRAVEL 90 DEGREE PATH THE USAGE OF BETA BLOCKERS CAN BE AVOIDED.
DUAL ENERGY SCANNING
BECAUSE X-RAY ABSORPTION IS ENERGY DEPENDENT, CHANGING THE ENERGY LEVEL OF THE X-RAY SOURCES RESULTS IN A METERIAL SPECIFIC CHANGE OF ATTENUATION.
WITH TWO X-RAY SOURCES SCANNING AT TWO ENERGY LEVELS, THE DSCT AQUIRES TWO SET OF DATA. FOR EXAMPLE, WE CAN DIFFERENTIATE A CALCIFIED AND NON-CALCIFIED PLAQUES.
OTHER APPLICATIONS
ALL KINDS OF REAL TIME FUNCTIONS ARE POSSIBLE, WHICH INCLUDES MIP,MPR Etc.
SPECTACULAR RESEARCH TOPICS LIE AHEAD, WAITING TO BE EXPLORED, AS DUAL ENERGY HELPS A BROAD SPECTRUM OF POTENTIAL CLINICAL APPLICATIONS.
POSSIBLE APPLICATION FIELDS ARE :
DIRECT SUBSTRACTION OF EITHER VESSELS OR BONE DURING SCANNING
CLASSIFICATION OF TUMOURS IN ONCOLOGY
CHARECTARISATION OF PLAQUES
DIIFERENCIATION OF BODY FLUIDS IN EMERGENCY.
WORD:FOR THE MAN BEHIND THE MACHINE
• AMONG THE IMAGING MODALITIES CT HAS IT’S OWN VALUE AND ROLE. ADVANCEMENTS ARE ESSENTIAL FOR THE INCREASED DEMANDS MEDICINE. STILL, PATIENT CERE AND RADIATION PROTECTION SHOULD BE STRICTLY CONSIDERED…
BY
Mr:SUBIN.K
Siemens Application specialist, former DAMIT Student Dept. of IS&IR, SCTIMST 
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