眼窩耳孔線-人類学的基準線および 前鼻棘耳孔線-人類学的基準線交差角度の検討

摘要

頭蓋骨や脳の画像診断では，その構造が複雑であることから基準点および基準線を用いて再現性よく正確に撮影することが要求される.頭部領域の基準線には人類学的基準線(anthropological basal line: ABL)，眼窩耳孔線(orbitomeata1 basal line: OML),前鼻棘耳孔線(acanthiomeatal line: AML)が存在し，X線撮影はもと よりX線computed tomography (CT)およびmagnetic resonance imaging (MRI)などの診断領域，さらに放射線治療領域において利用されている.%Orbitomeatal basal line-anthropological basal line (OML-ABL), and the acanthiomeatal line (AML)-ABL crossing angles were measured using profile pictures. There were 219 volunteers in total:42 people four years old, 44 people nine years old, 45 people 14 years old, 43 people 19 years old, and 45 people 40 years or older (48±7.4 years). The average OML-ABL crossing angle was 14.3 degrees in the 4-year-old group, while that of the 40-year or older group was 11.1 degrees. The deviation width of the 4-year-old group was 4.8 degrees, and that of the 40-year or older group was 2.4 degrees. The average AML-ABL crossing angle was 12.3 degrees in the 4-year-old group, while that of the 40-year or older group was 15.7 degrees. There were differences between males and females. The deviation width of the 4-year group was 5.4 degrees, and that of the 40-year or older group was 2.7 degrees. The results showed that 14.0 degrees for around 4-year-old, and 12.0 degrees for around 9- to 14-year-olds, could be used as OML-ABL crossing angles as a practical proposition.