IEC TS 62791-2015 pdf free download.Ultrasonics – Pulse-echo scanners – Low-echo sphere phantoms and method for performance testing of gray-scale medical ultrasound scanners applicable to a broad range of transducer types.
Properties of ultrasound phantoms, such as speed of sound and attenuation coefficient, can vary with temperature. Consult the specifications published by the phantom manufacturer to determine whether the expected acoustic properties are maintained under the above environmental conditions. If not, the environmental conditions over which expected and reproducible results can be obtained from the phantom or test object should be adopted for tests described below
6 Equipment required
6.1 General
The test procedures described in this Technical Specification should be carried Out U5ifl9 tissue-mimicking phantoms with digitized image data acquired from the ultrasound scanner.
6.2 Phantom geometries
6.2.1 Phantoms for use in the frequency range 2 MHz to 7 MHz
The phantom should allow imaging to a depth of at least 16 cm and provide for display of the entire B-scan image frame. Low-echo spheres should be available for detectability assessment over the entire image frame and the diameter of these spheres should be specified by the manufacturer within +1 % The mean number of spheres per unit volume should be at least 1 per millilitre. but the volume fraction consisting of spheres should not exceed 3.3 %. Scanning windows should provide for contact of the entire emitting surface of the transducer (active area of a transducer), while allowing elevational translation of the transducer over a sufficient distance that the most likely number of spheres traversed by the scan plane at or near the focal distance(s) is 25 or more in a 5-mm depth interval A low-echo sphere diameter between 3 mm and 4 mm is recommended for adequate performance assessment in the 2 MHz to 7 MHz range.
NOTE One low-echo sphere can serve as two such spheres if total internal reflection at a planar 5urtace provides an independent image See Annex A for an example of geometry
6.2.2 Phantoms for use in the frequency range 7 MHz to 15 MHz including “microconvex” arrays
The phantom should allow imaging to a depth of at least 10 cm and provide for display of the entire B-scan image frame. Low-echo spheres should be available for detectability assessment over the entire image frame and the diameter of these spheres should be specified by the manufacturer within ±1 %. The mean number of spheres per unit volume should be at least 8 per millilitre. but the volume fraction consisting of such spheres should not exceed 3,3 %. Scanning windows should provide for contact of the entire emitting surface of the transducer while allowing elevational translation of the transducer over a sufficient distance that the most likely number of spheres traversed by the scan plane at or near the focal distance(s) is 25 or more in a 2 mm-depth interval. A low-echo sphere diameter between 1 mm and 2 mm is recommended for adequate performance assessment in the 7 MHz to 15 MHz range.IEC TS 62791 pdf download.