Synthesis of parametric map from raw ultrasound B-scan data/Parametriniu vaizdu sinteze naudojant neapdorotus ultragarsinius B skenavimo duomenis

There are presented results of ultrasound radio-frequency signal sampling and processing to synthesize B-scan maps and evaluate two-dimensional visualization of ultrasound signal parameters. Our source of signal was ultrasound echoscope Mentor AdventTM A/B with mechanical scanning transducer of 11 MHz. Radio-frequency signal was digitized with digitizer Picoscope 5203. Amplitude and frequency based parameters were used for mapping B-scan ultrasound images. Standard phantom with axial resolution targets was used for the evaluation of mapping performance. We conclude that the signal processing and image transformation implemented in Matlab programs provide adequate two-dimensional mapping of B-scans. The usage of mean instantaneous bandwidth of radio frequency echoscopic signals enables to improve lateral resolution. Ill. 6, bibl. 11 (in English; summaries in English, Russian and Lithuanian). Pateikiami ultragarsiniu radijo dazniniu signalu skaitmeninimo ir apdorojimo rezultatai siekiant sintezuoti B skenavimo vaizdus ir ivertinti dvimati ultragarsiniu signalu parametru vaizdavima. Signalo saltinis buvo ultragarsine echoskopine sistema Mentor Advent™ A/B su 11 MHz mechaninio skenavimo keitikliu. Radijo dazninis signalas buvo skaitmenintas skaitmenikliu Picoscope 5203. Ivertintos dvimacio vaizdavimo galimybes tiriant isilginio skiriamumo taikinius standartiniame fantome. B skenavimo vaizduose parodytos ne tik amplitudines, bet ir daznines echosignalo savybes. Sis tyrimas parode, kad apdorojant signalus ir transformuojant vaizdus Matlab terpeje galima gauti adekvacius dvimacius B skenavimo vaizdus. Naudojant radijo dazninio echoskopinio signalo vidutini momentini juostos ploti, galima pagerinti skersini skiriamuma. Il. 6, bibl. 11 (anglu kalba; santraukos anglu, rusu ir lietuviu k.).