Tag: fluorescence

  • Live Animal Imaging Confocal Activates Vascular Clotting

    On a recent project I had an opportunity to collaborate with some great manufacturers and vendors, to build a custom microscope for Dr. Chia-Yi (Alex) Kuan, at the University of Virginia School of Medicine. This instrument is quite unique, and required a team of manufacturers to pull it off.

    Completed system ready for use.

    Dr. Kuan required an upright confocal microscope, which could perform photoactivation, widefield and confocal fluorescent excitation, all while running on an extended focus throw of 2″ range. The system required several custom pieces of hardware and software, which made things extra *fun*.

    This image was taken from a live specimen, showing cranial vasculature in vivo.

     

     

     

     

     

     

    Team Contributors

    Visual Dynamix LLC, headed by Gary Tockman, was the lead system integrator on the project as well as the primary service provider for the system. Gary led the team on the build and did an excellent job defining input specifications and performance criteria, as well as managing the crazy logistics of building a system from so many different vendors.

    Using the same device for slides and for live specimens required some work on the focuser throw. Sutter Instruments provided a great solution via the BOB microscope. Chris Ballard spent a great deal of effort working out a long travel Z motor relying on the MPC control system for XYZ axis.

    89 North provided the photostimulation system, confocal, and LDI laser excitation. Scott Phillips and Simona Stelea both spent several days on site working on the system to make sure everything was dialed in properly.

    Scott Phillips works on cable connections

    All of the devices on the system needed control via Metamorph. I worked with David Biggs over at KB Imaging to handle this part, and was very glad I chose his work. David has extensive experience with driver development, and due to the proprietary nature of the firmware on this instrument, his experience saved the day on dialing in the driver for speed and reliability.

    Finally, I took on the system I/O side for lasers and triggering, as well as building the imaging PC and configuring Metamorph. Because the latest Triggerscope 3 model needed to drive the lasers,I also managed to work with David to create a Metamorph driver, so if you happen to run MetaMorph and want to control the triggerscope, please get in touch.

    Gary inspecting the filters on the XLight

     

     

     

     

     

    Systems like this usually require a day or two for the install, but in our case, most of the install team spent a week on site, to be certain that the details were ironed out and to get some training on the system in for the end users. In our situation this was a good call, as we found the inevitable last minute changes which needed to be addressed. Having the team together made addressing these things straightforward.

    Results

    A bit after leaving, the client sent over a beautiful video showing experimental data which includes the visualization of vasculature, with a clot stimulated by the laser exciter, and a resulting timelapse of that clot forming.

     

    Training for end users on a live specimen

     

    It’s great to be able to participate with clients, manufacturers and engineers who can pull builds like this together, and better still to watch this important and exciting research move forward. I’m even happier I get to share this build!

    -Austin

     

     

     

     

     

  • ARCLED 8 Channel LED Engine

    I’m happy to announce a new product made by ARC. Over the years I’ve worked with a large number of illuminators, from mercury excitation lamps to laser combiners. I’ve tried to combine the best traits of a light source into this device, while ignoring some of the super-awesome features that drive costs up. Key to this is to be completely flexible in LED selection. This is a “dichroic-less” device, as such, one can select as many close-line LEDs as needed for a given application. In addition, LED’s can be installed after purchase by end-users, should they need to add or modify custom modules to the system. Another great advantage for users is the ability to use a broad spectrum white channel, built into the device with the discrete LED channels. This is a unique advantage over other devices, for in many cases all that is required is a broad spectrum light source and a filter cube. Finally, due to the nature of the design and manufacturing engineering of this product, we can offer this multi-channel exciter at what I believe is the lowest price in the industry, $8,500 USD with 8 LEDs installed.

    Here’s a brief video showing the device, you can purchase it from the online store here.

  • DIY emission filter for observer safety

    I can’t believe I missed this excellent post from Sam Lord @ Everyday Scientist on how to insert an emission filter on your ocular lightpath. Having been hit by some untold number scopes wherein I either was observing, and switched to a no-emission-filter spot on the dichroic turret, or where I was observing and for one reason or another (software reset?!?!) the excitation shutter opened inadvertently, I can say with certainty that if you work on scopes long enough, this WILL HAPPEN, and it’s not good.

    Of interest is the FDA’s ophthalmic instrument guidance docs for retinal radiation (sec H 2.c). From my perspective, it’s surprisingly vague.

    Because prolonged intense light exposure can damage the retina, the use of the device for ocular examination should not be unnecessarily prolonged, and the brightness setting should not exceed what is needed to provide clear visualization of the target structures. This device should be used with filters that eliminate UV radiation (< 400 nm) and, whenever possible, filters that eliminate short-wavelength blue light (<420 nm).

    “The retinal exposure dose for a photochemical hazard is a product of the radiance and the exposure time. If the value of radiance were reduced in half, twice the time would be needed to reach the maximum exposure limit.

    Bottom line, if you have a scope which is equipped with an emission filter wheel, this is something you should address.

    -Austin

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