COMPONENTS OF CT SCANNER

SIR SYED UNIVERSITY OF ENGINEERING AND TECHNOLOGY

SYED HAMMAD AKHTER

2012-BM-071

PRESENTED TO

ENGR. FAHAD AKBER

COMPONENTS OF CT SCANNER

Gantry Data acquisition system

Operating console

GantryDonut shaped part of CT scanner

Largest part of CT

Known as heart of CT

All circuits placed in it

Consist ofXray tube Pre-patient collimeter Patient table Post patient collimeter Detector

X-ray tube

Collimeter

Patient table

Consist of anode and cathode.Compensating filters are used to reduce the radiation dose to patients and help to minimize image artifactsPre and post are presentReduce scattered radiations that reaches to detector array.

Patient lies on the couch and moved through Gantry aperture during examinationMade of carbon fibres to prevent it from interfering with xrays

DETECTORS There are two type of detector•Scintillation detector•Gas filled detectorSCINTILLATION PMT PhotocathodeMaterial are used Sodium iodide Bismuth

Germinate Cadmium

tungstateConverts x-rays to

signalsin term of light by

theprocess of

Scintillation.

GAS FILLED Xenon Krypton Xenon + krypton

DATA ACQUISITON SYSTEM Convert analog signals from the detector into digital signals

DetectorsCurrent to

voltage converter

Preamplifier

computer A/D converter

Analog Integrator

OPERATING CONSOLE

It consist of more than 1 consoles For RadiologistFor PhysicianFor Data storage (film ,CD,hardware)

GENERATION MOVEMENT BEAM TYPE DETECTOR IMAGING TIME

First Translate-rotate

Pencil beam (single beam)

Single 5 min

Second Translate-rotate

Fan beam 5-30 30s

Third Rotate-rotate Fan beam 5000-700/1000 1s

fourth Rotate-stationary

Fan beam 4000 30ns

GENERATIONS OF CT SCANNER