‘Spatial pulse length’ is the product of the wavelength and the number of cycles in a pulse A shorter wavelength (and thus higher frequency) results in a shorter spatial pulse length Resolution is determined by the ‘spatial pulse length’ of the...
Resolution can be defined as: The detail of the image determined by the ability to distinguish two points as separate in space Two components of resolution can be considered: Axial Resolution Lateral Resolution The ability to distinguish between to structures along...
Due to 4 key mechanisms: 1. Reflection 2. Refraction 3. Scatter 4. Absorption Reflection away from the transducer when they come into contact with an interface at an angle other than 90° Bending of the ultrasound beam when a beam strikes an interface at an angle...
Attenuation can be defined as: The net energy loss from the interaction of tissues with the ultrasound beam. This results in the amplitude and intensity of ultrasound waves decreasing as they travel through tissue Attenuation affects high-frequency ultrasound waves to...
Reflection occurs when waves encounter an interface or boundary between materials with different acoustic impedances The difference in impedance between mediums is known as the reflection coefficient The greater the reflection coefficient, the greater the size of the...
