Although the Biopac system we use does have a pulse oximeter unit available for purchase, we use an MRI-compatible Nonin 8600FO (see Note 1) and feed the analog signal to a UIM100C add-on module. The UIM100C has multiple analog input channels, so we use a separate one for the TTL signal input from the MRI equipment as well.
|Figure 1 - Nonin 8600 FO pulse ox unit|
|Figure 2 - Pulse oximeter sensor on finger|
|Figure 3 - Pulse data and TTL pulses recorded in Acknowledge|
Respirator beltFor acquiring respiration data we use the DA100C module along with a transducer that then attaches to a pneumogram sensor. The module attaches directly to our MP150 and UIM100C units thanks to the piecewise nature of the Biopac system.
|Figure 4 - Biopac pneumogram sensor|
|Figure 5 - Respiratory sensor and elastic belt|
|Figure 6 - Respiratory data and TTL pulses in Acqknowledge|
|Figure 7 - Breath hold and recovery data with TTL pulses in Acqknowledge|
Note 1: Our Nonin unit has been discontinued for several years. It is a legacy device that's at least a decade old. We've purchased several newer pulse oximeters, even another one from Nonin, and none of them worked as effectively as the 8600FO. We currently have another pulse oximeter on order and I plan on updating this post once we fully test it.
Note 2:The adjustable elastic band did not come with the Biopac system but with the Siemens 3T Trio instead.