Abuhamad Alfred
Department of Obstetrics and Gynecology, Eastern Virginia Medical School, Norfolk, 23501, USA.
Semin Perinatol. 2005 Dec;29(6):376-9. doi: 10.1053/j.semperi.2005.12.004.
Nuchal translucency (NT) describes an echo-free area, below the skin, in the posterior nuchal and back region of the fetus and is typically observed in the first and early second trimester of pregnancy. A wide NT has been correlated with chromosomal and congenital abnormalities in the fetus. An accurate NT measurement is a critical component of the estimation of Down syndrome risk in the first trimester of pregnancy and the Nuchal Translucency Quality Review Program (NTQR) identified nine criteria that ensure an accurate measurement of NT during ultrasound examination. The purpose of this chapter is to present the technical aspects of obtaining an accurate NT measurement on ultrasound as outlined by the NTQR.
颈部半透明厚度（NT）指的是胎儿颈部后部和背部皮肤下方的无回声区域，通常在妊娠的第一和妊娠早期第二阶段观察到。NT增厚与胎儿染色体及先天性异常有关。准确测量NT是孕早期唐氏综合征风险评估的关键组成部分，颈部半透明厚度质量评估项目（NTQR）确定了九条标准，以确保超声检查期间准确测量NT。本章的目的是介绍NTQR所概述的超声准确测量NT的技术要点。
