Computed and Digital Radiography Intro

Question 1

describe the image receptors used in conputed radiography

Answer 1

they use a phosphor imaging plate which is sorted into a cassette which come in different sizes depending on the body part being imaged

Question 2

explain the image aquisition process

Answer 2

when the patient is xrayed the photons pass through the patient amd strike the phosphor layer of the imaging plate and are absorbed until the plate is processed

Question 3

how is the practitioner able to assign the correct patient

Answer 3

the practitioner will scan the barcode on the imaging plate which corresponds to that patient on the computer system

Question 4

how are phosphor imaging plates processed

Answer 4

they are processed using a computer readiography plate reader which scans the phosphor layer using a laser beam which causes the stored photon energy in the phosphor layer to be released as visible light which then strike the photomultiplier tube which converts it into an electrical signal

this electrical signal is the coverted into digital signal using ADC

the imaging plate is then erased suing white light

Question 5

explain the image viewing process

Answer 5

the image is viewed on the CR reader and a 10 point checklist is carried out

Question 6

how are images stored

Answer 6

the images are stored on a computer on PACS