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A teaching and information resource on ventilation/perfusion imaging in Nuclear Medicine, primarily for the differential diagnosis

of Pulmonary Thrombo-Embolism (PTE/PE), especially where the images are complicated by the presence of other diseases

such as pneumonia and chronic obstructive airways disease (COPD/COAD).



Technegas - The use of a unique ventilation agent invented at the Australian National University in 1984 has steadily grown since; to the point where it has become the agent of choice for the ventilation component of the V/Q diagnostics procedure in 53 countries, having been used in at least 3 million patients.   This academic site, including >250 published papers, is a common reference point on the technology.



Cyclomedica -Makers of the Technegas Plus Generator.


The European Association of Nuclear Medicine (EANM) is a professional non-profit medical association that facilitates communication worldwide between individuals pursuing clinical and research excellence in nuclear medicine. It currently has 30,000 members from 35 National societies, plus affiliated members from outside the European union. A Continuing Medical Education program is a vital part of the Associations work, and the recent open publication of these guidelines for diagnosing pulmonary embolism is a good example of the outcome from that program.

The following two links are their ‘guidelines’ for lung imaging. They provide a very comprehensive rationale for V/Q SPECT, and should be read by referring Doctors unfamiliar with this technology.


EANM Part 1

EANM Part 2



FREE     smiley

Segment Chart Pack

Pulmonary emboli, particularly isolated and relatively small ones, are often detected best by their alignment with the segmental anatomy of the lung, seen as a defect on the perfusion image.   We have created a transparency of lung segment outlines in representative coronal and sagittal sections to assist in this process.  It comes complete with its segment label card and explanatory text.   Ask us for a free copy at