Coding of a High Precision XY Gantry for Testing Acoustic Output of Ultrasonic Transducers
UCARE project presentation of coding of high precision XY gantry for testing acoustic output of ultrasonic transducers
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- [00:00:00.660]Hi, my name is Juliana Rodriguez.
- [00:00:02.640]And today I will be talking about my
project titled coding of a high position X
- [00:00:07.440]Y gantry for testing acoustic
output of ultrasonic transducers.
- [00:00:12.660]So to begin a little bit of
background on ultrasound technology,
- [00:00:16.200]ultrasound is an imaging modality. That
uses the sound waves to create an image.
- [00:00:20.310]There are multiple different
kinds of ultrasound.
- [00:00:22.380]As there are many uses
for it. For this project.
- [00:00:24.810]We use transcranial Doppler
ultrasound, also known as TCD,
- [00:00:28.530]and it's a type of ultrasound that has
been developed to measure cerebral blood
- [00:00:32.550]flow and has been shown to be really
valuable in many clinical applications.
- [00:00:37.140]In this project,
- [00:00:37.920]a high position precision positioning
system is used to set up a
- [00:00:42.720]system that will test TCD devices to
make sure they meet safety requirements
- [00:00:48.420]diving in further to the
background of this project.
- [00:00:50.850]The main goal is to set up a system
that will test the safety of ultrasound
- [00:00:54.900]devices. Testing is carried out to ensure
device is safe for eventual purposes,
- [00:00:59.400]whether that be cerebral
blood flow detection or
ultrasound of fetuses in a womb
- [00:01:04.350]measurement of their acoustic output
is really important to ensure only safe
- [00:01:07.860]levels are being sent into the body.
- [00:01:10.200]The current technology that exists is
typically testing temperature, rise,
- [00:01:14.100]output power, pressure, and intensity.
- [00:01:16.770]The way these are determined
varies for each property.
- [00:01:18.850]Desired pressure is
measured through the use.
- [00:01:21.660]So a positioning system in combination
with a hydrophone and a water tank the
- [00:01:26.010]hydrophone produces a voltage wave form
when placed in the ultrasound field.
- [00:01:30.240]And in turn provides information needed
to determine the pressure intensity is
- [00:01:35.070]similar in that it can be measured,
but instead it's with a heat sensor.
- [00:01:38.820]Most often though, it is simply
calculated from pressure measurements.
- [00:01:41.910]Using a specific formula output
is measured using radiation force
- [00:01:46.560]balance methods for our project.
- [00:01:49.260]Future steps would begin with these
properties and further studies will be done
- [00:01:52.980]for other requirements and
other properties to ensure
all IEC requirements are
- [00:01:57.090]met on the device being tested.
- [00:01:59.490]IEC standards are
international standards that
are set in place to ensure
- [00:02:03.810]a device produced
only produces safe levels
- [00:02:08.760]in its output.
- [00:02:13.230]moving on to the specifics of his project,
- [00:02:15.540]the X Y gantry system used was
previously created by another student.
- [00:02:19.740]And it's been the framework of
this project and the images shown.
- [00:02:22.950]We see the positioning
system, the way this works,
- [00:02:25.640]the device holds the transducer
in this section here,
- [00:02:28.980]and a hydrophone is placed below
within a water tank that would also be
- [00:02:33.420]inside of the system here.
- [00:02:37.740]The system moves the transducer in a
set path while hydrophone measures the
- [00:02:41.550]sound intensity using the system,
- [00:02:43.740]a code was edited to set up the
requirements needed to meet the standards
- [00:02:49.170]The goal of this project was to enable
the system to move in a desired form so
- [00:02:53.880]that measurements could be collected
and later be used for testing actual
- [00:02:58.020]ultrasound devices for
safety. For the methods
- [00:03:03.480]First a goal was set,
- [00:03:05.190]which was to make the system follow a
set path and make multiple stops for data
- [00:03:08.910]collection as well as be able
to change areas, specifications,
- [00:03:13.230]knowing the goal.
- [00:03:14.010]The next step was to clean up the code
and understand what was originally set up
- [00:03:19.140]to what it was originally set up to do,
- [00:03:21.360]and then determine any changes that needed
to be made after those shortcuts were
- [00:03:25.530]added for position, assignment
and area conditions.
- [00:03:28.710]Micro stepping was also
troubleshot during these steps.
- [00:03:32.940]As the motors could only run
at one level, which was ,32
- [00:03:36.810]microstepping and all
- [00:03:41.790]micro-step levels,
were then made available.
- [00:03:45.210]And the system was able to interchange
between any level throughout the whole
- [00:03:48.930]There was testing of the gantry system
to ensure that whatever the code said was
- [00:03:53.400]actually being preformed,
- [00:03:57.990]we have a flow chart of the actions made
by a user to start and run the system.
- [00:04:03.400]It can be read here.
- [00:04:06.450]The results for this project consisted
of being able to select a starting range
- [00:04:10.680]that could be moved to any
point on the X Y axis here,
- [00:04:14.520]depending on the
perimeter set by the user.
- [00:04:17.100]Any point in the area can be set as a
starting point by simply stating the
- [00:04:20.610]coordinate step size issues
were fixed and allowed for
- [00:04:25.020]program programmable desired
micro-step of one, two, four, eight,
- [00:04:29.820]16, or 32.
- [00:04:31.710]The program was also able to get the
system to run in a set path with length
- [00:04:35.940]and width easily adjustable within the
code delay for data collection was also
- [00:04:40.530]figured out. And the user
- [00:04:42.870]would be able to set a time for
the device to stop between steps.
- [00:04:47.250]This allows for a hydrophone to collect
output measurements throughout the test
- [00:04:54.120]in the future of this project will
continue on to create a fully functioning
- [00:04:57.480]positioning system that will be
used for ultrasound safety testing.
- [00:05:01.470]Following this project in particular,
- [00:05:03.420]a data acquisitioning system
will be connected so that
- [00:05:08.400]hydrophone data could directly go into
labVIEW or whatever software desired,
- [00:05:14.280]and then produce data needed to determine
specific levels of acoustic output
- [00:05:18.900]from the ultrasound. With that,
- [00:05:23.250]I would like to thank Dr.
- [00:05:24.330]Bashford and Ben for all of
their support in this project,
- [00:05:26.940]as well as for believing in me.
- [00:05:28.500]And I'd also like to thank Matt Currie
for his help, with the mechanics.
- [00:05:31.950]And of course you care, McNair, UNL, and
all of Biba for all of their support.
- [00:05:38.370]Thank you again. Here are my references.
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