Phantom
AssigneeHitachi, Ltd.
InventorKen-ichi Kawabata
Life of this patent
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Abstract
This invention provides an ultrasonic phantom that can respond to different ultrasonic intensities. Such ultrasonic phantom comprises a gel comprising a low-boiling compound in the form of droplets sealed therein. The invention also provides an assay technique using such phantom. This invention enables regulation of components of droplets, droplet size, and the ultrasonic intensity at which droplets are vaporized upon mixing of droplets with different sizes. This enables visualization of whether or not ultrasound beams that exceed relevant different ultrasonic intensities have been applied.
Claims12
A phantom comprising:
- a thermally-irreversible gel;
- a contrast medium disposed in the gel, the contrast medium comprising first liquid droplets having an average particle diameter of 0.5 μm or smaller and second liquid droplets having an average particle diameter greater than 0.5 μm and 20 μm or less, wherein, upon ultrasonic irradiation, at least one of the first liquid droplets and the second liquid droplets shift from a liquid phase to a gas phase;
- and
- a container that accommodates the thermally-irreversible gel and the contrast medium.
A method for assaying ultrasonic irradiation conditions comprising the steps of:
- applying ultrasound beams to a phantom comprising a thermally-irreversible gel, an indicator of temperature increase accommodated in the gel, and a contrast medium that shifts from a liquid phase to a gas phase upon ultrasonic irradiation and shifts from a gas phase to a liquid phase upon cooling after ultrasonic irradiation;
- attaining first detection results by optically detecting denaturation of the indicator of temperature increase resulting from ultrasonic irradiation and a shift of the contrast medium from a liquid phase to a gas phase;
- cooling the phantom following the step of ultrasonic irradiation;
- attaining second detection results by optically detecting a shift of the contrast medium from a gas phase to a liquid phase following the step of cooling;
- and
- comparing phase shifts of the contrast medium based on the first and the second detection results to assay the ultrasonic irradiation conditions based on the results of comparison.
Dependencies are inferred from the claim text.