Safety
2.14 3D-Resolution and Sensitivity
•
All resolution and sensitivity claims are based on phantom testing only.
These claims do not directly correspond to or imply clinical performance.
NOTE:
All system claims made are based on testing done with Dr. Madsen's phantom.
DESCRIPTION OF Dr. MADSEN'S PHANTOM
The phantom is designed and constructed by Ernest L. Madsen, Ph. D., in the Department of Medical
Physics at the University of Wisconsin Medical School.
This 3D ultrasound phantom contains two sets of spherical targets. All spherical targets in the same set
have coplanar centers and the same diameter and identical contrastsa over the total depth of 15cm.
The center-to-center separation between adjacent spheres is 0.5cm in the vertical plane and 1.5cm in
the horizontal plane.
Specifications:
Dimensions (h x w x d):
20cm x 18cm x 8cm
Housing
Material:
Acrylic
Wall Thickness:
1 cm
Scan
Surfaces:
1
Scan Surface Material/Dimension: Saran Wrap 2.5mm
Scan Surfaces Dimensions:
15cm x 5cm
We can reconstruct high contrast spherical images in the 3 to 5 mm diameter range in 3 orthogonal
planes only for targets that have negative contrast of at least -17dB (for 3mm and 4mm) / -14dB (for
5mm) backscatter relative to the background level (based on Dr. Madsen's phantom).
This is because the -17dB / -14dB contrast levels were the only high contrast levels tested.
•
We can detect large targets, i.e., spheres of 3, 4, and 5 mm in diameter.
This pertains only high contrast large targets (i.e., contrast of -17dB / -14dB or higher).
•
We can detect large targets, i.e., sphere of 5 mm or larger in diameter.
This pertains only low contrast large targets (i.e., contrast of at least +3dB).
NOTE:
The resolution in orthogonal, reconstructed plane is considerably lower than that of the
primary scan plane. The system resolution is particularly lower for low contrast targets in the
reconstructed, orthogonal plane.
Significant system artifacts may exist in the orthogonal plane parallel to the face of the probe.
a Defining the backscatter coefficient of the material forming the lesions to be Bl and that the
background material to be Bbg, the contrast is defined (in dB) as 10 log10 (Bl / Bbg).
Voluson
®
730 - Instruction Manual
105838 Rev. 3
2-19
Содержание Voluson 730
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