| 释义 |
placentography Med.|plæsɛnˈtɒgrəfɪ|
[f. placenta + radiography.]
Examination of the placenta using radiography or ultrasound.
1935Canad. Med. Assoc. Jrnl. XXXII. 12/1 The placenta is capable of absorbing a large amount of the thorium circulating in the blood, of retaining it for hours and days, and of eliminating it. However, the placentography interfered with fetal nutrition and led frequently to abortion. 1938W. H. Ude et al. in Amer. Jrnl. Roentgenol. XL. 37/1 Since the object of this procedure is the roentgenologic demonstration of the placenta as a soft tissue mass interposed between the visualized urinary bladder and the presenting fetal part, we will refer to the method hereafter as ‘indirect placentography’. 1967I. Donald in 5th World Congr. Gynaecol. & Obstetr. 525 Ultrasonic placentography has now become commonplace practice. 1975A. E. James et al. in E. J. Potchen Current Concepts in Radiol. II. xi. 304 Radionuclide placentography is a method of directly localizing the placenta by imaging the placental blood pool.
Hence plaˈcentogram, (a) a radiograph of the placenta; (b) a radiographic examination of the placenta.
1959G. W. Files et al. Med. Radiographic Technique (ed. 2) xviii. 356 (caption) Placentograms. 1961Obstetr. & Gynecol. XVIII. 405/2 Despite all attempts to reduce the radiation dosage, it was calculated that 250–750 mr. were being delivered to the maternal ovaries and the fetus at the time of each placentogram. 1971Ibid. XXXVII. 604/1 Of the 84 patients on whom a placentogram was taken, painless third-trimester vaginal bleeding was the most common indication for the study (50 of 84). 1975A. E. James et al. in E. J. Potchen Current Concepts in Radiol. II. xi. 304 We have found a decrease in the number of placentograms performed, and an increased use of sonography in this circumstance. |