SPI Exam Dumps : Sonography Principles and Instrumentation

Axial resolution refers to the ability to distinguish two structures that are close to each other along the path of the ultrasound beam.

Spatial pulse length (SPL) is the distance over which one pulse occurs, and it directly affects axial resolution.

Shorter SPL improves axial resolution because it allows better differentiation of closely spaced structures.

The axial resolution is improved by increasing the frequency of the transducer, which shortens the wavelength and hence the SPL.References:

ARDMS Sonography Principles and Instrumentation guidelines on resolution parameters and their impact on image quality.

Comprehensive and Detailed Explanation From Exact Extract:

Interpolation estimates pixel values between scan lines by averaging adjacent data, filling in gaps to create a smoother, more complete image without additional scanning.

According to sonography instrumentation reference:

“Interpolation is a post-processing technique that fills gaps between scan lines by estimating values based on surrounding echoes, improving image smoothness.”

Therefore, the correct answer is D: Interpolation.

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Comprehensive and Detailed Explanation From Exact Extract:

Lateral resolution is the system’s ability to distinguish two structures side-by-side. It is directly determined by the beam width — the narrower the beam, the better the lateral resolution.

Principles and Instrumentation:

"Lateral resolution depends on beam width at a given depth. Narrower beams provide better lateral resolution."

Depth of penetration influences maximum imaging depth.

Propagation speed is largely constant in soft tissue.

Wavelength affects axial resolution.

Therefore, the correct answer is A: Beam width.

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