MultidetectorCT angiography (CTA) and MR angiography (MRA) are well-established non-invasiveimagingtechniques for the differential diagnosis of pulmonary hypertension (PH). CTA is considered as a gold standard for the diagnosis of pulmonaryembolism, but this method is accompanied with the radiation exposure and use of iodinated contrast media. MRA is a promising technique for the patients with PH. Few studies to date have sought to determine the accuracy of MRA in diagnosis of chronicthromboembolic PH [1-5]. The purpose of our study was to evaluate the diagnostic value of...

Study populations consisted of 10 patients (m/f -3/7; mean age – 34.5+-3.1) with CTEPH. CTA and MRA were performed in all the patients. CTA was performed at64-row scanner using dual-energy mode (GSI technique). The volume of the injected contrast medium was 40-7 0ml. MRA was performed at1,5T MR system using 10-15 ml of contrast agent (1 mmol/ml). 3-5 ml of contrast agent injected at 2,5 ml/sec were used for the dynamic perfusion study. After that CMR protocol for PH patents was implemented (SSFP and velocity-encoding...

All the patients had CTEPH. Patients data are presented in Table 1. Table 1. Patients data Parameter Value Age (y.o.) 48.5±3.1 Mosaic attenuation pattern 10 (10) Diameter of PA (mm) 33±7.6 PA/Ao diameter ratio 1,13±0,2 RV/LV diameter ratio 1,28±0,38 Collateral branches 7 (10) PA occlusion (MRA) 55 (131) – 42 % PA occlusion (CTA) 56 (131) - 42, 7 % PA stenosis (MRA) 39 (131) - 29,7 % PA stenosis (CTA) 48 (131) - 36,6 % In total 131 segmental PA branches and 131 lung...

Pulmonary MRA has a high diagnostic value in the patients with CTEPH. It is suitable for the assessment of pulmonary vessel morphology and pulmonary perfusion. It can serve as an alternative to CTA.

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