POST-PROCESSING - retrospective reconstruction, image reformation, 2D MPR

RETROSPECTIVE RECONSTRUCTION

uReconstruction of the RAW data to create new images. it is continuous axial images and can be done in 2D or 4D

where can retrospective reconstruction happen

operators console

what modifications can we do in RETROSPECTIVE RECONSTRUCTION

•DFOV

•Image center

•Reconstruction algorithm

Increase of slice thickness – cant decrease

Images created retrospectively are always in the x as the original images

SAME PLANE (and orientation)

►A t x is used when creating images retrospectively because raw data requires a vast amount of hard disk space and thicker slices would have less images high quality so the files are more manageable to view

hicker slice

image reformation is also called

image rendering

what is the difference between image reformation and retrospective reconstruction

image reformation only uses image data while retrospective reconstruction manipulates raw data to create new images

what is a rule that has to be followed when doing doing image rendering

• same DFOV

• same xyz coordinat5es

• same gantry tilt

what stands out about a 2D multiplanar reformation compared to a 3D

2D represents the original CT attenuation values

where can 2D multiplanar reformation be done

uCan be created at operator’s console or independent workstation

what planes can 2D MPR be in

transverse, coronal, sagittal, or oblique planes

how does a 2D MPR work

stacks contiguous transverse axial images

even though MPR were available before MDCT, why were they not used as much

image degradation between axial and reformatted

CPR stands for

CURVED PLANAR REFORMATION

what is CURVED PLANAR REFORMATION

images created along centerline of tubular organs

CURVED PLANAR REFORMATION

what is a pro about 2D MPR

• visualization of specific structures

• determines extent of pathology

• localize pathology

what is a con about 2D MPR

• loss of image detail

• the quality of reformatted images depend on the axial images

• use of thicker planes can make the image blurry and lose spatial resolution

►Scanner programmed protocols automatically generates

coronal and sagittal image planes

►Scanner programmed protocols viewing the x must be manually done by the operator

oblique and curved

MIPs

macimum intensity projection

PACS or independent workstations allow generation of

MIPs directly on the monitor