山崎 達雄¹, 鋤柄 稔¹, 原 義人², 尾本 良三¹

Tatsuo YAMAZAKI¹, Minoru SUKIGARA¹, Yoshito HARA², Ryouzo OMOTO¹

¹埼玉医科大学第一外科, ²埼玉医科大学第四内科

¹Department of Surgery, Saitama University School of Medicine, ²Internal Medicine, Saitama University School of Medicine

キーワード : Real-time two-dimensional Doppler echography (2-D Doppler), Thyroid gland

A total of seventy eight cases were examined for the color flow mapping of the thyroid gland. Of those, 21 cases were normal persons. Remaining 39 cases suffered from hyperthyroidism and 18 cases suffered from hypothyroidism. Aloka XA 340 (Frequency 5.0 MHz) was used for 2-D Doppler system. In this system the blood flow approaching the transducer is displayed in red color, whereas the away-flow is displayed in blue color. The minimum velocity is 5.0 cm/sec.
We could not obtain any color flow image inside the thyroidal parenchyma in normal persons. In three normal cases, the color flw image was gained around the thyroidal parenchyma. On the other hand, in the patients of hyperthyroidism, the color flow visualization was well obtained. The rate of color flow visualization was 100% in nine cases of uncontrolled hyperfunctional status. In these cases, the small vessels both inside the thyroidal parenchyma and around the thyroidal parenchyma were well displayed in color. In the well-controlled patients of hyperthyroidism, the rate of color flow visualization was 73% (22 to 30) in the parenchyma, and 53% (16 to 30) around the parenchyma, respectively. In the well-controlled patients of hypothyroidism, the rate of color flow visualization was 59% (10 to 17) in the parenchyma, and 53% (9 to 17) around the parenchyma, respectively. In an uncontrolled hypo functional status, We could not obtain any color flow image both inside the thyroidal parenchyma and around the thyroidal parenchyma. Thus, the incidence of color flow visualization seemed to be related with the swelling of the thyroid gland.
In conclusion, 2-D Doppler is useful to study not only the structure but also the functional status of the thyroid gland.