LukasW Log

Hello Open Source Hardware World! Starting to Log the progress around www.opensourceimaging.org

Fri Sep 30, 2016

COSI Magnet: Single ring results look fantastic! Less than 2% difference to simulation. Gluing needs some more quality control on airbubbles, one magnet popped out. Epoxy glue strong enough to hold two rings together, no extra mounting needed at the moment. Second ring is drying and the prototype magnet will be mounted and measured next week.

COSI Measure: Partlist finished. Only chassis mount left and connection cable (delivery beginning next week).

COSI RFPA: Power amp test successful, blanking/unblanking "dead" time around 100müs, should be sufficient. w6pql kit arrived, together with the transistors we have a spare part power amp stage now, just in case.

Outreach: 15 projects on Opensourceimaging.org, goal is 20 by the end of october. A petition has been started on a ISMRM study group on reproducible research, initially started as a software initiative, we will participate to put hardware on the agenda as well.

Tue Sep 27, 2016

T-Con with Manuel Moritz (Hamburg) and Felix Arndt (lawyer) on organizing workshop beginning of october on legal strategies for open source value creation (collab with Prof. Dana Beldiman). Casestudy: open source MRI COSI-Measure: new motor couplers arrived, do we have higher speed and power now? COSI-Magnet: Individual rings glued, next: measurement of a single ring and assembly.

Mon Sep 26, 2016

Gagetron [1], OpencoreNMR [2] and SimpleElastix [3] added to the website. COSI-Measure: cable chains mounted, working fine now

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Fri Sep 23, 2016

Presentation for the Science Hack Day Berlin 2016 [4] finished. Here you can find the presentation: [5]

COSI-Measure: Bad news, Bas the creator of the Beagle Bone add on board BeBoPr++ apparently passed away [6], we need some alternative design now

RFPA: Good news thanks to Werner, new transistor in place and the RFPA is running. We will try it out next week and hopefully no more surprises.

Thu Sep 22, 2016

Gradient: Simulations done for the prototype, radius ~ 20cm -> Gradient strength ~30mT/m, Concept for the mechatronic subsystem of the gradient ready plus nice drawings by Eva  :)

Wed Sep 21, 2016

Magnet: PMMA parts arrived, hurray! Now glueing can start of the first prototype magnet.

COSI-Measure: CAD files modification for limit switch holder and cable chain generated and send for 3D print. Cables and connectors ordered.

Tue Sep 20, 2016

Poster for World Health Summit finished. File:20160909 WHS Poster OpenSourceImaging LukasWinter.pdf

Mon Sep 19, 2016

RFPA: Transistor in power amp module down, input power to driver stage accidently too high hence input power at power amp too high. Solution: New LDMOS transistor ordered and damping at driver input will be included (hardware) to adjust the range to 0-1V (SDR output range). The damping can be replaced easily later on if another spectrometer is used, but a protection on hardware side is safer than on software side only.

Fri Sep 16, 2016

OSI outreach: Monthly team meeting yesterday (Simone, Haopeng, Ruben, Brian, Lukas). Targeting ISMRM Engineering Study group presentation slot at the next meeting (-> Simone), projectupload ongoing goal to reach 20 projects by october, fuse efforts with MR-Hub (talk to Brian Hargraeves and create project upload page)? Open up meistertask board and connect to slack, create guidelines page (license + legal framework + medical device development)

COSI hardware: RFPA: un-/blanking timing solved, 600A transistor and 0.1ohm resistor solves the timing issue after blanking, now we are at around 100müs after transmit pulse until readout can be applied which is sufficient RF Coil: measurements done (Christian) at PTB with TEM cell and Frank Magnet: PMMA rings ordered, gradient simulations ongoing (-> Raphael) Measure: Finishing the cabling/connectors (-> Haopeng), modified 3D CAD chain holder needed (-> Lukas), motor coupler order did not arrive yet (26.08.)