**8. Conclusions**

The superiority of V/P SPECT over other imaging techniques in the diagnosis of PE has been well demonstrated. The examination is without contraindication and can be performed in 99% of patients with suspected PE. V/P SPECT makes it possible to quantify the extent of perfusion loss, so that PE treatment can be better adapted to the needs of individual patients. By using V/P SPECT, it is also possible to diagnose other cardiopulmonary conditions.

Because of the very low radiation exposure, it is an ideal method for evaluating treatment and follow up. Low radiation doses are particularly important for women in the reproductive period and during pregnancy.

The above mentioned advantages of V/P SPECT for studying PE lead to the conclusion that it is the only suitable technique both for follow-up in patients with PE as well as for validation of treatment therapies. Moreover, it is an essential tool for research.
