Spatial Resolution - IPE

spatial resolution

degree of accuracy of the structural lines recorded in the image

spatial resolution refers to

smallest object that can be detected

spatial resolution is which type of property

geometric

other names for spatial resolution

definition, sharpness, recorded detail, detail

all radiographic images have less

spatial resolution than the object itself

umbra

area of image sharpness

penumbra

area of unsharpness surrounding the image

material factors affecting detail

matrix size, pixel size, and grayscale bit depth

matrix

square series of boxes that gives form to the image

pixels

individual matrix boxes

grayscale bit depth

number of shades of gray a pixel can represent

factors techs can control to affect detail

OID, SID, focal spot size

if OID is increased

area of unsharpness will increase (detail decreases)

OID and spatial resolution have what relationship

inverse

if SID is increased

area of unsharpness on the image will decrease (detail will increase)

SID and spatial resolution have what relationship

direct

because x-ray photons come from an area instead of a single point

each photon in the beam forms its own image of the object

increasing the focal spot size will

decrease spatial resolution

FSS and spatial resolution have what relationship

inverse

because of the anode heel effect the degree of unsharpness will be greater on the

cathode side

penumbra =

focal spot size x OID/SID

motion affects detail because it

fails to allow enough time for a well-defined image to form

involuntary motion may include

heartbeat and peristalsis

ways to reduce motion

communication, reduced exposure time, and immobilization