Lecture 16 Flashcards
Mechanical transducer has
Single element fixed with a motor
Mechanical transducer sweeps
Back and foth and produces a sector image
Method is almost obsolete
Automatic scanning aka
Electronic scanning
Automatic scanning is
Live
Probe is constantly sending out pulses and receiving echoes
Building images even while you are holding still
Automatic scanning is showing images in _____________
Sequence at so many frames per minute that it looks like a live scan rather than individual pictures
There needs to be more than one ______ to do electronic scanning
Element
Multiple elements =
An array (rectangular crystals, asembeled in rows)
Required for electronic scanning
Single element is called a
Disk
Linear array is
Several elements in a row
The two ways to operate linear array
Sequencing and phasing
Linear sequenced array usually called
Linear array
Linear sequenced array involves
Firing groups of elements at the same time
In Linear sequenced array ______ is apploed in groups
Voltage
Each group of a Linear sequenced array acts like a
Single element
What is the aperture of the Linear sequenced array
The width of the group
Each group of Linear sequenced array will produce a _____ and recieve a ______ therefore each group will produce a ______
Pulse
Echo
Scan line of information
Mulitple scan lines will produce
A rectangular image
Width of the Linear sequenced array image =
Length of array
Linear image consists of ___________ traveling _______
Parallel scan lines
Traveling in the same vertical direction
LPF
Lines per frame
of scan lines in a frame
Individual scan lines build up a
Frame
Frame is stored in _____ and pulled out and displayed as _____
Memory
Image
In sequencing scan lines come from
Element groups
More LPF produces
Better images
When fired in groups of 3-4 , it will produce ______ the scan lines
Double
Convex/curvilinear array full name
Convex sequenced array
Convex sequenced array operation is ______ to linear sequenced array
Identical
Convex sequenced array produces
A modified sector exam
