The Study Of The Effect Of The Tissue Harmonic Imaging On Image Quality And Construction Measurement

Objective: To evaluate the effect of the tissue harmonic imaging (THI) on image quality and construction measurement. Methods: One hundred and twenty patients including various of diseases were studied by using fundamental imaging (FI) and THI (1.8-3.6,2.1-4.2MHz)modes respectively. Images were reviewed and ranked blindly for image quality, then devided them into two groups depending on thescore with FI ( I : 1=best, II :2, 3=worst) and the constructions of the heart were measured. Results : (1) Image quality was significantly improved with THI than that of FI mode in II groups . (2) The mean thickness value of interventricular septum and left ventricular posterior wall with THI were greater than those with FI in I and II groups ( I group: interventricular septum 9. 22 3. 19 /and 9. 22 3. 03 vs 8. 29 2. 65mm P <0. 05; left ventricular posterior 9.08 3.30 and 9. 15 3. 32 vs 8. 49 3. 05mm P<0. 05. II group: interventrieular septum 1L64 3. 64 and 11.75 3. 89 vs 11. 04 3. 70 P <0. 05, left ventricular posterior 10.29 2. 07 and 10. 40 1.89 vs 9. 50 1. 86mm P <0. 05) and the diameter of left ventricular cavity at the end of diastolic period was smaller(I grouP:51.68 12.37 and 51.73 12,30 vs 52.63 12.83;II group:49. 94 7. 38 and 49. 88 7. 64 vs 50. 81 7.43mm P<0. 05 ) (3) In interatrial septum defect patients, the defect size was smallerwith THT than FI( systolic:20. 60 11. 93 and 21. 35 12. 59 vs 23.00 12.91;diastolic:25. 50 15. 77 and 25. 59 16. 35 vs 26. 74 16. 35mm P<0.05) (4) In mitral stenosis patients, the mean value of mitral area was smaller with THI than FI ( 77. 22 24. 42 and 79. 80 25.24 vs 82. 23 26. 00mm2 P <0. 05). Conclusion: THI can improve image quality in patients with poor imaging. In measurement, there is a difference between the values of FI and THI.