本文还讨论了多囊肾血流多普勒频谱变化的机制。
Mechanism of Doppler blood flow ultrasonic spectrum of the polycystic kidney was discussed.
结论：彩色多普勒血流频谱形态在小乳腺癌早期诊断中具有较高的应用价值。
Conclusion: The color Doppler flow spectrum have high applicated value in early diagnosis of small mammary cancer.
目的探讨胎儿肝静脉的多普勒血流频谱及其临床意义。
Objective To study the Doppler flow spectrum of fetal hepatic vein.
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