Physics of Sonography; Transducer Physics and Terms
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each of the black spaces below before clicking
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| A complete scan of Ultrasound beam is called a _____. | Frame.
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| The two methods of sending out scan lines to form an image are _________ and _________. | Mechanical and electronic
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| Electronic Scanning is the dominate form of transducers. True or False? | True
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| What is an Array? | A grouping arrangement of parts forming a complete unit
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| Name the 3 types of Arrays | Linear, Convex, Annular
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| What are 2 alternate names for Linear Array? | Linear Sequenced; Linear Sequential
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| A Linear Array produces a ______ Image | Rectangular
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| A rectangular image is produced by pulses that originate at different/same points across transducer. | Different
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| Firing Sequence is? | How many elements are fired in each group.
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| The Linear Sequenced Array is fired how? | Sequential
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| The Linear Sequenced Array is Electronically/Mechanically focused? | Electronically
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| What are 3 alternate names for a Convex Array? | Curved Sequenced Array; Curved Sequential Array; Curvilinear array
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| The element in a Convex Array is curved. True or False? | True
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| Do Linear Sequential Arrays have electronic steering and focusing? | Yes
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| Convex Arrays form a ______ image | Sector
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| A Curvilinear Array is fired how? | sequentially
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| Name 3 types of Arrays for Phased Arrays | Sector; Vector; Linear phased
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| A phased array applies voltage to all elements at almost the same time. True or False | True
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| Define Phasing | Voltage applied to all elements at almost the same time.
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| Steering the beam is also known as _____. | Sweeping the beam
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| Sweeping the beam is produced by _____. | Phasing
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| When steering the beam, a _____ shaped image is created. | Sector
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| A Sector is a ______ array | Phased
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| What is a Vector? | A Sector transducer, but one which the scan lines do not have a common point of origin.
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| A phased array has Electronic steering AND focusing. True or False? | True
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| Phased Arrays are used for? | Cardiac, Abdominal, Neonatal, and Endocavitary
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| One ultrasound pulse can create multiple focal zones. True or False? | False
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| A single line of elements can focus in how many planes? | Only one plane
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| What are the other names for Section Thickness? | Slice Thickness; Section Thickness
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| Section thickness is the second dimension of the ultrasound beam. True or False? | False; It's the third dimension
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| A single line of elements can electronically focus or steer only in the third dimension. True or False? | False; only in the scan plane
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| Focus can be achieved in the third dimension with a _____ or _____ _____ | Lens; Curved Elements
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| With three rows of elements, phasing can be applied to focus the third dimension electronically. True or False? | True
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| What eliminates the need for a lens or curved element? | Electronic Focusing
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| What is a Grating Lobe? | Sound that escapes outside the main beam in a multi element transducer.
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| What is the purpose of Apodization? | To reduce grating lobes by varying the voltage to individual elements.
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| What is a Vector Array? | An array that is created by phasing a linear sequenced array.
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| Which Array has a flat footprint: Sector Array or Vector Array? | Vector Array
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| How is a parallelogram created? | Phasing that is applied to linear sequential arrays.
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| How is an Annular Array Focused? | Focused by Phasing
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| Annular Arrays cannot steer the beam. True or False? | True
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| With Annular Arrays, the beam is steered Electronically. True or False | False; Mechanically
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| The Listening Focus is known as? | The Dynamic Focus
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| A Dynamic Focus continually changes as... | the tissues are scanned
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| 4d imaging is... | 3d imaging in real time
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