Resolution

RESOLUTION

is a term which describes the ability of an imaging system to differentiate between structures, images or events and display them as separate entities

Spatial resolution

ability to display two closely spaced structures as separate images.

Resolved structures

structures are considered resolved when shown as separate images.

Detail resolution

another term for spatial resolution.

Spatial resolution

use the highest frequency that still provides adequate penetration.

Beam focusing

improves spatial resolution when focused at the area of interest.

Multiple focal zones

can improve spatial resolution if subject motion is not an issue.

Axial resolution

ability to distinguish two objects parallel to the ultrasound beam.

Longitudinal resolution

another term for axial resolution.

Axial resolution direction

measured along the axis of the ultrasound beam.

Axial resolution

determined by spatial pulse length.

shorter pulse length

produces better axial resolution.

Maximum axial resolution

equal to half the spatial pulse length.

wavelength

Axial resolution directly dependent on .

Higher frequency effect

improves axial resolution by reducing wavelength

parallel to the ultrasound beam

Axial resolution has the ability to distinguish two objects

Axial resolution synonyms

also called linear, longitudinal, depth, or range resolution.

Lateral resolution

ability to distinguish two objects perpendicular to the ultrasound beam.

Azimuthal resolution

another term for lateral resolution.

Lateral resolution

measured at right angles to the ultrasound beam.

Lateral resolution

determined by beam width or beam diameter.

narrower beam

produces better lateral resolution.

Best lateral resolution

equal to the beam width at the focal zone.

smaller transducer size

improves lateral resolution.

higher frequency

improves lateral resolution.

Lateral resolution synonyms

also called transverse, angular, or horizontal resolution.

Contrast resolution

ability to differentiate tissues and display them as varying shades of gray.

use the highest frequency

that still provides adequate penetration.

Temporal resolution

ability to display events occurring at different times as separate images.

Temporal resolution importance

essential for imaging rapidly moving structures like the heart.

Frame rate

another term for temporal resolution.