Leading the way
in Transcranial
Diagnostic Ultrasound


Power M-mode Transcranial Doppler with HDO™ Digital Processing

Transcranial Doppler Ultrasound

st3 Transcranial Ultrasound System —

With true Power M-mode and HDO digital processing, the ST3 Transcranial Doppler from Spencer Technologies is the preeminent TCD system. TCD Neurovascular exams and cerebral embolic monitoring with transcranial ultrasound can now be performed easily with state of the art digital technology. The ST3 Power M-mode Transcranial Doppler is an extremely accurate method of measuring cerebral blood flow velocities and a sensitive method of detecting emboli. Spencerís ST3 TCD systems can be configured to meet your needs whether monitoring stroke patients for vasospasm, detecting cerebral emboli or detecting the presence of a patent foramen ovale (PFO).

ST3 Technology

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  • HDO(High Definition Oversampling) digital processing for a high fidelity M-Mode
  • Patented Power-M-mode for highly sensitive embolic monitoring
  • High Pulse Repetition Frequency (PRF) for high velocity measurements
  • Multiple report formats
  • Custom system configurations


Terumo Trifid Service Status

Spencer Technologies will no longer provide service, technical support, or accessories for the Terumo Trifid Transcranial Doppler. The Terumo Trifid model was manufactured exclusively for Terumo Cardiovascular Systems Corporation and production was discontinued in 2007. If you are still using the Trifid and are interested in upgrading to the Spencer Technologies' current TCD system, please contact sales@spencertechnologies.com for information on our trade-in incentive program.

Spencer Technologies Has Moved To Redmond Washington

In August 2014 Spencer Technologies moved to Redmond Washington. Our new address can be found in the Contact Us section.

ST3 on NBC Report

The Spencer Technologies ST3 was recently featured in an NBC report on the possible link between PFO and migraine.

Watch video of ST3 used in diagnosing PFO, courtesy MSNBC and NBC News Channel.

Neuroimaging, An Issue of Neurologic Clinics

The latest book, Neuroimaging, An Issue of Neurologic Clinics, by Laszlo Mechtler contains the most up to date information regarding Neurologic Clinics, and the use of transcranial Doppler (TCD).

“Since the introduction of TCD by Rune Aaslid in 1982, the most important technical advancement has been the addition of power motion-mode Doppler (PMD) to the single-channel TCD screen. Before PMD, TCD provided only spectral waveforms that were not obvious to clinicians because they had no imaging or depth-perception information attached to them, and multiple waveforms from different depths had to be put together to identify vessels and pathologic changes. PMD detects not only the presence of flow but also its depth, direction, and resistance to memorize these parameters.”