CNI widgets - Revision history

imported>Bobd at 01:07, 8 February 2017

2017-02-08T01:07:08Z

← Older revision		Revision as of 01:07, 8 February 2017
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	[[File:cni_touch.jpg\|thumb\|CNI touch-pad.]]		[[File:cni_touch.jpg\|thumb\|CNI touch-pad.]]
	We designed and developed an MR-compatible touch-sensitive surface. It uses a [http://www.magictouch.com/addon.html KEYTEC] [http://www.atmel.com/Images/doc8091.pdf 4-wire resistive touch] glass connected to a [http://www.pjrc.com/teensy/ Teensy 2.0] with [https://github.com/cni/widgets/blob/master/touch/touch.pde custom firmware]. This devices connects via USB and will show up as a Serial Port on your machine. It streams the absolute position using a simple serial protocol. Here is [[codeserialport\|some sample code]] to get coordinates in Matlab. We built the case for the tablet out of clear acrylic using the laser cutter at the [http://www.stanford.edu/group/prl/prl_site/Content/Room36.html Stanford PRL Room 36] shop.		We designed and developed an MR-compatible touch-sensitive surface. It uses a [http://www.magictouch.com/addon.html KEYTEC] [http://www.atmel.com/Images/doc8091.pdf 4-wire resistive touch] glass connected to a [http://www.pjrc.com/teensy/ Teensy 2.0] with [https://github.com/cni/widgets/blob/master/touch/touch.pde custom firmware]. This devices connects via USB and will show up as a Serial Port on your machine. It streams the absolute position using a simple serial protocol. Here is [[codeserialport\|some sample code]] to get coordinates in Matlab. We built the case for the tablet out of clear acrylic using the laser cutter at the [http://www.stanford.edu/group/prl/prl_site/Content/Room36.html Stanford PRL Room 36] shop.

			= Bone-conduction Audio System =
			See [[CNI Bone Conduction Audio System]].

	= Summary of connections to the scanner =		= Summary of connections to the scanner =

imported>Bobd: /* Summary of connections to the scanner */

2015-04-16T23:37:04Z

Summary of connections to the scanner

← Older revision		Revision as of 23:37, 16 April 2015
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	= Summary of connections to the scanner =		= Summary of connections to the scanner =
	[[File:startscan_trigger_port.jpg\|thumb\|Start scan trigger connection (back of SRF/TRF board, port J7).]]		[[File:startscan_trigger_port.jpg\|thumb\|Start scan trigger connection (PGR Cabinet, back of SRF/TRF board, port J7).]]
	* trigger in (used to start the scanner from a stimulus computer): PGR Cabinet, SRF/TRF board, J7 (in the back!)		* trigger in (used to start the scanner from a stimulus computer): PGR Cabinet, SRF/TRF board, J7 (in the back!)
	* trigger out (sends a pulse with every excitation): Pen cabinet exciter, BNC J11 (scope trigger)		* trigger out (sends a pulse with every excitation): Pen cabinet exciter, BNC J11 (scope trigger)
	* MR clock (needed by the EGI EEG system): Pen cabinet exciter, BNC J9 (10MHz clock)		* MR clock (needed by the EGI EEG system): Pen cabinet exciter, BNC J9 (10MHz clock)
	* physio data stream (needed for EEG): PGR cabinet, DB9 physiological monitoring port (this in in the back of the big gray box just above the RF amp. You need to remove the cover on the side of the PGR cabinet to get to it.)		* physio data stream (needed for EEG): PGR cabinet, DB9 physiological monitoring port (this in in the back of the big gray box just above the RF amp. You need to remove the cover on the side of the PGR cabinet to get to it.)

imported>Bobd at 23:35, 16 April 2015

2015-04-16T23:35:55Z

← Older revision		Revision as of 23:35, 16 April 2015
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	= Summary of connections to the scanner =		= Summary of connections to the scanner =
			[[File:startscan_trigger_port.jpg\|thumb\|Start scan trigger connection (back of SRF/TRF board, port J7).]]
	* trigger in (used to start the scanner from a stimulus computer): PGR Cabinet, SRF/TRF board, J7 (in the back!)		* trigger in (used to start the scanner from a stimulus computer): PGR Cabinet, SRF/TRF board, J7 (in the back!)
	* trigger out (sends a pulse with every excitation): Pen cabinet exciter, BNC J11 (scope trigger)		* trigger out (sends a pulse with every excitation): Pen cabinet exciter, BNC J11 (scope trigger)
	* MR clock (needed by the EGI EEG system): Pen cabinet exciter, BNC J9 (10MHz clock)		* MR clock (needed by the EGI EEG system): Pen cabinet exciter, BNC J9 (10MHz clock)
	* physio data stream (needed for EEG): PGR cabinet, DB9 physiological monitoring port (this in in the back of the big gray box just above the RF amp. You need to remove the cover on the side of the PGR cabinet to get to it.)		* physio data stream (needed for EEG): PGR cabinet, DB9 physiological monitoring port (this in in the back of the big gray box just above the RF amp. You need to remove the cover on the side of the PGR cabinet to get to it.)

imported>Bobd: /* Summary of connections to the scanner */

2015-04-16T23:34:27Z

Summary of connections to the scanner

← Older revision		Revision as of 23:34, 16 April 2015
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	= Summary of connections to the scanner =		= Summary of connections to the scanner =
	* trigger in (used to start the scanner from a stimulus computer): ~~Pen cabinet exciter~~, ~~BNC J3~~ (~~RTO_DAC~~) ~~[check this!]~~		* trigger in (used to start the scanner from a stimulus computer): PGR Cabinet, SRF/TRF board, J7 (in the back!)
	* trigger out (sends a pulse with every excitation): Pen cabinet exciter, BNC J11 (scope trigger)		* trigger out (sends a pulse with every excitation): Pen cabinet exciter, BNC J11 (scope trigger)
	* MR clock (needed by the EGI EEG system): Pen cabinet exciter, BNC J9 (10MHz clock)		* MR clock (needed by the EGI EEG system): Pen cabinet exciter, BNC J9 (10MHz clock)
	* physio data stream (needed for EEG): PGR cabinet, DB9 physiological monitoring port (this in in the back of the big gray box just above the RF amp. You need to remove the cover on the side of the PGR cabinet to get to it.)		* physio data stream (needed for EEG): PGR cabinet, DB9 physiological monitoring port (this in in the back of the big gray box just above the RF amp. You need to remove the cover on the side of the PGR cabinet to get to it.)

imported>Bobd: /* GE physiological data monitor */

2014-12-19T23:26:57Z

GE physiological data monitor

← Older revision		Revision as of 23:26, 19 December 2014
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	We also built a device to read serial data from the GE MR750 physiological monitoring port in the PGR cabinet. We need to detect the pulses in real-time for EEG balistocardiogram artifact removal. Unfortunately, the pulses are not available in the GE system, but they do provide the raw PPG data (along with respiration belt and ECG data).		We also built a device to read serial data from the GE MR750 physiological monitoring port in the PGR cabinet. We need to detect the pulses in real-time for EEG balistocardiogram artifact removal. Unfortunately, the pulses are not available in the GE system, but they do provide the raw PPG data (along with respiration belt and ECG data).

	The data come in 12-byte (96-bit) packets delivered at 115200 bps. A packet comes every 5ms, with silence between packets. This produces data bursts of 96bits / 115.2bits/ms = .8333ms with 5 - .8333 = 4.1667ms of silence. (This timing pattern was confirmed with a scope.) So we can detect the start of a data packet by waiting for the silent period before the data arrives. Here we only care about the PPG value. But the code could be easily modified to do something with the other physiological readings.		The data come in 12-byte (96-bit) packets delivered at 115200 bps. A packet comes every 5ms, with silence between packets. This produces data bursts of 96bits / 115.2bits/ms = .8333ms with 5 - .8333 = 4.1667ms of silence. (This timing pattern was confirmed with a scope.) So we can detect the start of a data packet by waiting for the silent period before the data arrives. Here we only care about the PPG value. But the code could be easily modified to do something with the other physiological readings. (More details are available in the [https://github.com/cni/widgets/blob/master/physmon/physmon.pde physmon firmware code].)

	To detect a pulse, we compute a running mean and standard deviation and compute a z-score for each new data point. When several consecutive data point z-scores are above threshold, we signal that a pulse was detected. With a Teensy 2++ (which has 8k SRAM), we can maintain a buffer size of 1024, which is 1024 * 0.005 = 5.12 seconds. This seems to be enough to give a very stable pulse detection.		To detect a pulse, we compute a running mean and standard deviation and compute a z-score for each new data point. When several consecutive data point z-scores are above threshold, we signal that a pulse was detected. With a Teensy 2++ (which has 8k SRAM), we can maintain a buffer size of 1024, which is 1024 * 0.005 = 5.12 seconds. This seems to be enough to give a very stable pulse detection.

imported>Bobd: /* GE physiological data monitor */

2014-12-19T23:23:06Z

GE physiological data monitor

← Older revision		Revision as of 23:23, 19 December 2014
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	= GE physiological data monitor =		= GE physiological data monitor =
	[[File:physmon.png\|thumb\|CNI PPG pulse detector device.]]		[[File:physmon.png\|thumb\|CNI PPG pulse detector device.]]
			[[File:physmon_port.jpg\|thumb\|CNI PPG connection to the back of the STIF card in the GE PGR cabinet.]]
	[[File:physmon_rs232.png\|thumb\|RS232 level-shifter circuit for physmon.]]		[[File:physmon_rs232.png\|thumb\|RS232 level-shifter circuit for physmon.]]
	~~[[File:physmon_port.jpg\|thumb\|CNI PPG connection to the back of the STIF card in the GE PGR cabinet.]]~~
	We also built a device to read serial data from the GE MR750 physiological monitoring port in the PGR cabinet. We need to detect the pulses in real-time for EEG balistocardiogram artifact removal. Unfortunately, the pulses are not available in the GE system, but they do provide the raw PPG data (along with respiration belt and ECG data).		We also built a device to read serial data from the GE MR750 physiological monitoring port in the PGR cabinet. We need to detect the pulses in real-time for EEG balistocardiogram artifact removal. Unfortunately, the pulses are not available in the GE system, but they do provide the raw PPG data (along with respiration belt and ECG data).

imported>Bobd: /* GE physiological data monitor */

2014-12-19T23:20:17Z

GE physiological data monitor

← Older revision		Revision as of 23:20, 19 December 2014
Line 16:		Line 16:
	[[File:physmon.png\|thumb\|CNI PPG pulse detector device.]]		[[File:physmon.png\|thumb\|CNI PPG pulse detector device.]]
	[[File:physmon_rs232.png\|thumb\|RS232 level-shifter circuit for physmon.]]		[[File:physmon_rs232.png\|thumb\|RS232 level-shifter circuit for physmon.]]
	[[File:physmon_port.jpg\|thumb\|CNI PPG connection to the back of the GE PGR cabinet.]]		[[File:physmon_port.jpg\|thumb\|CNI PPG connection to the back of the STIF card in the GE PGR cabinet.]]
	We also built a device to read serial data from the GE MR750 physiological monitoring port in the PGR cabinet. We need to detect the pulses in real-time for EEG balistocardiogram artifact removal. Unfortunately, the pulses are not available in the GE system, but they do provide the raw PPG data (along with respiration belt and ECG data).		We also built a device to read serial data from the GE MR750 physiological monitoring port in the PGR cabinet. We need to detect the pulses in real-time for EEG balistocardiogram artifact removal. Unfortunately, the pulses are not available in the GE system, but they do provide the raw PPG data (along with respiration belt and ECG data).

imported>Bobd: /* GE physiological data monitor */

2014-12-19T22:55:31Z

GE physiological data monitor

← Older revision		Revision as of 22:55, 19 December 2014
Line 16:		Line 16:
	[[File:physmon.png\|thumb\|CNI PPG pulse detector device.]]		[[File:physmon.png\|thumb\|CNI PPG pulse detector device.]]
	[[File:physmon_rs232.png\|thumb\|RS232 level-shifter circuit for physmon.]]		[[File:physmon_rs232.png\|thumb\|RS232 level-shifter circuit for physmon.]]
			[[File:physmon_port.jpg\|thumb\|CNI PPG connection to the back of the GE PGR cabinet.]]
	We also built a device to read serial data from the GE MR750 physiological monitoring port in the PGR cabinet. We need to detect the pulses in real-time for EEG balistocardiogram artifact removal. Unfortunately, the pulses are not available in the GE system, but they do provide the raw PPG data (along with respiration belt and ECG data).		We also built a device to read serial data from the GE MR750 physiological monitoring port in the PGR cabinet. We need to detect the pulses in real-time for EEG balistocardiogram artifact removal. Unfortunately, the pulses are not available in the GE system, but they do provide the raw PPG data (along with respiration belt and ECG data).

imported>Bobd at 17:25, 20 October 2014

2014-10-20T17:25:56Z

← Older revision		Revision as of 17:25, 20 October 2014
Line 15:		Line 15:
	= GE physiological data monitor =		= GE physiological data monitor =
	[[File:physmon.png\|thumb\|CNI PPG pulse detector device.]]		[[File:physmon.png\|thumb\|CNI PPG pulse detector device.]]
			[[File:physmon_rs232.png\|thumb\|RS232 level-shifter circuit for physmon.]]
	We also built a device to read serial data from the GE MR750 physiological monitoring port in the PGR cabinet. We need to detect the pulses in real-time for EEG balistocardiogram artifact removal. Unfortunately, the pulses are not available in the GE system, but they do provide the raw PPG data (along with respiration belt and ECG data).		We also built a device to read serial data from the GE MR750 physiological monitoring port in the PGR cabinet. We need to detect the pulses in real-time for EEG balistocardiogram artifact removal. Unfortunately, the pulses are not available in the GE system, but they do provide the raw PPG data (along with respiration belt and ECG data).

imported>Bobd: /* GE physiological data monitor */

2014-07-14T20:31:52Z

GE physiological data monitor

← Older revision		Revision as of 20:31, 14 July 2014
Line 34:		Line 34:
	** 2x 4.7k resistors		** 2x 4.7k resistors
	** 2x 1N4148 signal diodes		** 2x 1N4148 signal diodes
			** 4x panel-mount female BNC connectors (such as http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?productId=658427 this one)
	Optional RGB LED:		Optional RGB LED:
	** Common-cathode RGB LED such as [https://www.sparkfun.com/products/9264 this one]. (A common-anode RGB LED can be used with a small change to the firmware code.)		** Common-cathode RGB LED such as [https://www.sparkfun.com/products/9264 this one]. (A common-anode RGB LED can be used with a small change to the firmware code.)