CT Scanner Components - Computed Tomography - Lecture Slides, Slides of Computed Tomography

Download CT Scanner Components - Computed Tomography - Lecture Slides and more Slides Computed Tomography in PDF only on Docsity!

Components of a

CT Scanner

Major Components

 Scanner room

 Imaging system  Generator (?)

 Electronics Room

 Power  Computer (?)  Generator (?)

 Operator’s Area

 Display / recording / storage  Computer (?)

Gantry Provides Structural

Framework for

collimators

filters

Detectors / electronics

Gantry Size Must Accommodate

 patients

 size of room

 Truck transport to

hospital

The gantry is pre-assembled at the factory

Special Clinical Gantry Concerns

Patient aperture

Tilt range

Cooling of

electrical components

x-ray tube

Patient Couch

 Vertical travel

 minimum height for stretcher transfer

 Horizontal travel

 reduces need for re-positioning patient  accuracy

Patient Couch Requirements

 Safe for patients

 Easy to clean

 Radiolucency

 Speed

 Pretty?

 Siemens offers colors

Imaging System

 Produces x-rays

 Shapes & filters (hardens) beam

 collimates  attenuates for uniformity

 May detect (measure) pre-patient beam

intensity

 Provides digital intensity data to computer

Imaging System Components

 Filter

 protects patient from low-energy photons  provides a beam closer to mono-energetic  provides a more uniform beam

 Detector & electronics

 also called data acquisition system (DAS)  includes A-D converter  provides digital information to reconstruction computer

Computer System Components

 Input / output devices

 Detectors  Printer

 Central processing units

(CPU’s)

 Array Processor

 Reconstruction Hardware

 Interfaces to other

computers

• Remote service
• RIS
• Archive
• Web browser

 Communications hardware

 Software

• enables above hardware operation
• image manipulation
• scanning control

Image Display, Record, Storage

 Display output image

 Facilitate storage / retrieval of digital data

 Provide permanent hard-copy for

 referring physician (?)

Computer & Image Processing

 Hardware

 Special processing architecture

 Software

CT Software Functions

 Operator console

 Allows operator to communicate with computer & scanner  keyboard  touch screen  mouse / trackball

 Control of scanner

• Gantry tilt
• scout / axial
• field of view
• x-ray technique
• slices » how many » thickness » overlap

CT Software Functions

 Control of imaging

 selection of pre-stored image protocols  Selection of reconstruction algorithm

 Operating System

 often UNIX  multiuser  multitasking  controls hardware