Questions we hear
How do I choose a visual system?
Avotec has two choices: projectors and fiber optic glasses (goggles). Projectors are the least expensive, easiest to use, and will probably satisfy the needs of most users. Fiber optic glasses are the most expensive, and are need only for binocular visual presentations.
Why buy from Avotec?
Experience. We have been doing this for more than twenty years, all over the world, for every type of magnet. Reliability. We routinely see systems that are still operating for more than ten years.
How do I install a system?
Detailed instructions are in each Operating Manual. Installation generally involves routing cables from the Control Room to the Pen Panel in the Equipment Room, and from the Pen Panel to the Magnet.
How do I order a custom Product?
Give us a call and tell us what you would like to do. We would be happy to tell you how we can help. And if we cannot help, we will try to refer you to someone who can.
How can I find detailed specs?
Our product literature contains specification for each system. If you have further questions, please give us a call.
What is RF Interference & SNR?
RF interference that is visible in an MR image is usually called an artifact, such as the “zipper artifact” shown here. This is perhaps the least dangerous kind of noise because it is visible, so you know you have a problem. Any equipment that generates this kind of noise is not MR compatible, and certainly has not undergone any kind of rigorous testing.
Why choose a projector instead of an LCD screen?
Two reasons. First, our MR-Mini projector is less than half the cost of an LCD screen. Second, our projector offers many more ways of presenting an image to your patients because, (i) the small size of the projector (5 lbs/ 2.5 kg) allows many mounting options and (ii) the projector lens allows the image size to be changed, something an LCD cannot do.
What does In-Bore Inert™ have to do with MR-Safe?
MR-Safe means that a device can be used with no restrictions within Zone 4 (in the Magnet Room). This means that all electronic devices cannot be MR-Safe, but only MR-Conditional at best. MR-Safe does not consider the effects of EMI (electromagnetic interference). In-Bore Inert™ is an SNR measure used by Avotec to indicate that an Avotec system has a noise signature that is below the background noise of the MR.
What is the frequency response of the audio system?
The frequency response should tell you want you want to hear out of the audio system. However, this is one of the most misused specifications.
There are two steps in creating sound your patient hears. The first is connecting an audio input (CD player) to the system. This input is an electrical input, NOT an acoustic input. Unfortunately the frequency response of the input is often quoted as the response of the system.
The second part of the system is the sound coming out of the headset to the patients' ears. Because of natural attenuation in the speakers system and pneumatic headset, this is ALWAYS MUCH LESS than the input.
Although the frequency response of the output is much less and the input, we have a solution! Ask about adding a calibrated equalizer to your MRI audio system.
Much more dangerous is noise that decreases the signal-to-noise ratio (SNR). In this case, details that should be visible in the MR image do not show up because they are “buried” in the noise. It is precisely this problem that the In-bore Inert™ philosophy addresses. All Avotec systems are guaranteed to be “invisible”, that is, they are below the noise floor of the scanner and the shielded room.