Coding of a High Precision XY Gantry for Testing Acoustic Output of Ultrasonic Transducers

Juliana Rodriguez Author

04/05/2021 Added

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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
[00:02:48.000]needed.
[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 other
[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
[00:03:48.330]process.
[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
[00:04:50.910]path
[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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Coding of a High Precision XY Gantry for Testing Acoustic Output of Ultrasonic Transducers

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