WearableUltrasound


 * Our final presentation in the hackathon: here
 * This was done the Friday afterwards: http://mediagoblin.tami.org.il/u/alonlevy/m/doppler-ultrasound-transceiver-demonstration/
 * LaunchPadSignalGenerator - using the TI Tiva evaluation board (Cortex M4) to generate a signal, how to setup the gcc stack. (didn't try code studio).

= TODO =

Transmitter

 * 6 MHz pulse, TI board bit banging is too slow, possible to use PWM.
 * Trying out the gpio on the raspberry pi
 * using memory mapped registers works wonderfully, (original, and my tweak) but still gives some jitter. But it should be good enough to start.
 * If I ever decide to write a kernel module: http://elinux.org/RPi_Kernel_Compilation,
 * Amplifier

SI570 (similar to a DDS but produces a square, not sinus, wave)
 * http://www.qsl.net/k5bcq/Kits/Kits.html

DDS
 * ebay:   Business & Industrial > Electrical & Test Equipment > Test Equipment > Signal Sources & Generators > Signal
 * 35$ AD9850 based sig gen - http://www.ebay.com/itm/AD9850-DDS-Signal-Generator-Module-0-30MHz-Sine-Square-Wave-Frequency-AD9851-/230966684516?pt=LH_DefaultDomain_0&hash=item35c6afeb64
 * 404 AD9850 based sig gen - http://www.ebay.com/itm/AD9850-DDS-Signal-Generator-Module-0-40MHz-New-/270864751254
 * They are not as controllable as the digital out pin of X, need to read datasheet.
 * AD9851 is slightly better than the AD9850

Receiver

 * Amplifier. 40 DB, how?
 * One of
 * Mixer to remove central frequency (driving frequency) and reduce to pulse width frequency
 * Sampler per pulse width (2 us -> 500 KHz -> ~2 MSPS)
 * or
 * Sampler for full width, 6 MHz, ~20 MSPS. Better then 8 bits - the more the merrier.

= Ultrasound sensor physics and construction = Videos
 * https://www.youtube.com/watch?v=arNAMxCgVKs - hour long lecture on piezoelectric cells
 * https://www.youtube.com/watch?v=rpmtztt5W08 - making of a piezoelectric cell from barium titanate.
 * cellphone (windows mobile) used with a usb ultrasound probe http://www.youtube.com/watch?v=kjm9nQ5_bUk
 * refers to a 'phantom' - dummy for ultrasound demonstration

Complete probes
 * interson SeeMore usb probe (used in the cellphone app above) http://www.interson.com/products/seemore-153-usb-probes

Average speed of sound in tissue: 1540 m/s. Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3760231/#!po=25.0000

= Weekathon notes = Notes from the IATI MNC weekathon wearable bladder monitoring device weekathon Prep day notes
 * Project outline:
 * Ultrasound sensor
 * how to build?
 * where to buy a crystal? what size? how does it relate to the driving frequency? receive/
 * Use 6 MHz
 * Get raspberry pi working
 * Get gpio 6 MHz on the pi
 * Opamp @Tami to get to 5V at least from pi using a breadboard / weld stuff
 * 3M from Nachum.
 * TODO 5 V at entrance with op amp
 * TODO 6 MHz, not 3 MHz
 * TODO take with me from the hacker space per what Aba said:
 * soldering station (take mine)
 * make some easy hook wires
 * tomorrow: check that the p6d works
 * TODO can I make an ADC from one of the chips we have?
 * DONE can I make a pulse generator from the EK-TM4C123GXL? yes.
 * DONE can I use the oscilloscope of Guy to record the signal? no.
 * Getting ge p6d probe to work
 * about it
 * http://www.providianmedical.com/ultrasound-probes/ge/ge-p6d/
 * pulse generator
 * low part count, 20 Hz - 13 KHz but variable with C1. http://www.maximintegrated.com/app-notes/index.mvp/id/1960
 * a2d
 * 10 Million samples per second (10 MSPS)
 * mixer
 * ultrasound general electronics documentation:
 * not really interesting
 * http://www.ti.com/solution/ultrasound_system TI application note about beam forming UT.
 * http://www.bioee.ee.columbia.edu/courses/upload/Bibliography/kim_ultrasonic_2006.pdf - 250 MS/s IC paper.
 * DONE Meeting with Ronen's coworker at GE
 * Etgar 4 Tirat Hacarmel, 49/45/47; take train at 8:25 from
 * Bladder monitor
 * sensors, can it work with 40Khz cheap distance sensor?
 * if not, how cheap can we find an imaging (X MHz ?) sensor? interfaces to RPi?
 * build a model, plastic bottles, for development and demo.
 * forced drinking for forced urination (> 300 ml / 15 minutes)
 * ordering of input/output of sensor
 * side by side (like regular distance sensors)
 * one on front, one on back

Links

 * Bladder
 * https://www.ncbi.nlm.nih.gov/pubmed/9366371 Estimating normal bladder capacity in children.
 * Transducers
 * http://zetroz.com/products/index.php
 * http://www.visualsonics.com/transducers
 * http://spinoff.nasa.gov/spinoff/spinitem?title=bladder+monitor
 * http://www.sensorwiki.org/doku.php/sensors/ultrasound
 * http://www.sensorsmag.com/sensors/acoustic-ultrasound/mems-reshapes-ultrasonic-sensing-1066
 * General
 * https://en.wikipedia.org/wiki/Therapeutic_ultrasound
 * http://www.ob-ultrasound.net/history1.html
 * Analog to Digital
 * http://www.analog.com/en/analog-to-digital-converters/ad-converters/AD9261/products/product.html 30 MSPS 16 bit
 * Devices
 * 100$ transmit only? http://news.cornell.edu/stories/2008/12/grad-student-creates-portable-ultrasound-devices
 * Theraputic, other uses
 * Shoulder pain
 * http://scitation.aip.org/content/asa/journal/poma/19/1/10.1121/1.4800272
 * Horses
 * http://www.ultroz.com/