Imaging - DETAIL

Detail is degree of radiographic sharpness

Line pairs per milimeter (lp/mm) or cycles per mm

Their range can only usually see up to 5 lp/mm

It is digital imaging recorded detail

• Spatial resolution is determined by:
• - matrix size
• - pixel size
• - gray scale bit depth
• - voxel

There is either high frequency and low frequency.

• Shorter wavelengths have higher frequency and higher detail.
• Longer wavelengths have lower frequency and less detail.

• It is measured in 3 ways:
• - Point Spread Function ( PSF )
• - Line Spread Function ( LSF )
• - Modulation Transfer ( MTF )

Its a process where it ensures that no data is missed by sampling the information twice.

When nyquest criterion is violated and messes up causing imaging problems such as the murray effect ( lines going across the image )

Image noise is background information that the receptor receives. This is shown as quantum noise or quantum mottle ( Graininess of image because of insufficient photons )

Resolution demosntrates fine detail of structures close to the size limits of the naked eye.

• - With good communiocation.
• - FOr thsoe who cant stay still that well, reduce the length of exposure.

Get aptient right up to the IR when possible and use positions that reduce OID.

- Higher OID leaves room for more magnification which usually contintutes lost of detail

A reduced focal spot size would mean a less divergent beam which in turn streams straighter photons resulting in better detail.

Phosphor screens with smaller phosphors will result in better detail. ( Smaller crystals = better detail )

Longer SID will result in better detail because of the divergence of the beam. With larger SID, you have a bigger divergence and a larger area for straighter photons to get through.

Stat Orders From Surgery Follow Cutting Mistakes

• S = SID
• O= OID
• F= Film Screen
• S= Screen Speed
• F= Focal Spot
• C= Contact
• M= Motion

Increased SID = Better detail

Less OID = better detail because of less magnification.

Slow F/S = better detail because of smaller crystal sizes.

Smaller focal spot = better detail because its more of a straight beam than a wider one.

More film screen cotnact = better detail

Less motion = better detail

• FSS( Focal Spot Size ) x OID
• SID - Source to Image Distance

Smallest focal spot size, minum oid and longest SID.