Term
| The resonant frequency of the transducer is determined by the: |
|
Definition
|
|
Term
| The most effective crystal thickness is ______ the wavelength. |
|
Definition
|
|
Term
| The primary purpose of the damping material is: |
|
Definition
| Decrease the number of cycles per pulse |
|
|
Term
| Which of the following is NOT a purpose of the matching layer? |
|
Definition
| Create smooth interface with patient for saftey, comfort and easy movement |
|
|
Term
| The optimal matching layer thickness is ______ the wavelength. |
|
Definition
|
|
Term
| The region where the sound beam is the smallest is reffered to as the : |
|
Definition
|
|
Term
| The Fraunhofer Zone is also known as the: |
|
Definition
|
|
Term
| Regarding Beam Formation, what occurs in the Fraunhofer Zone? |
|
Definition
Increased attenuation
Increased diffraction |
|
|
Term
| Lateral resolution is also known as: |
|
Definition
|
|
Term
| Which of the following factors does not determine lateral resolution? |
|
Definition
|
|
Term
| The near zone length is determined by: |
|
Definition
Transducer frequency
Wavelength
Crystal diameter |
|
|
Term
Axial resolution is also known as: |
|
Definition
|
|
Term
| Axial resolution is determined by: |
|
Definition
|
|
Term
| The type of transducer that utilizes concentric rings is called: |
|
Definition
|
|
Term
| The type of transducer that uses its geometric design to steer the elements and create a quasi sector shape image is called: |
|
Definition
|
|
Term
| _________ is NOT an advantage of harmonic imaging. |
|
Definition
|
|
Term
| ______ is NOT considered a method of focusing? |
|
Definition
|
|
Term
| Which of the following is a disadvantage of annular phased array transducers? |
|
Definition
|
|
Term
|
Definition
| Non-linear tissue propagation of sound |
|
|
Term
| _______ is NOT used as piezoelectric material? |
|
Definition
|
|
Term
| Which statement about harmonics is least correct? |
|
Definition
| Harmonics results because the compressed tissue propagation is slower than the stretched or rarefraction tissue. |
|
|
Term
| Matrix array transducers typically have how many elements? |
|
Definition
|
|
Term
| Which statement about the advantages of Matrix array transducers are least correct? |
|
Definition
| Are mechanically steered and electronically phased |
|
|
Term
| Dynamic aperature changes the area of the crystal or number of elements that are receiving the returning echoes to: |
|
Definition
| Create uniform lateral resolution throughout the imaging depth, both in the near field and far field. |
|
|
Term
| Dicing and sub-dicing of elements in a transducer: |
|
Definition
Provides seperation to eliminate "cross-talk" between elements
Reduces the amount of off axis energy that causes grating-lobes
The optimum separtaion for most applications is 1/2 the crystal wavelength or less. |
|
|
