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The Haller index, created in 1987 by Dr. Haller, Dr. Kramer, and Dr. Lietman,〔Haller JA, Kramer SS, Lietman A. Use of CT scans in selection of patients for pectus excavatum surgery: a preliminary report. Journal Pediatric Surgery 1987;22:904-6〕 is a mathematical relationship that exists in a human chest section observed with a CT scan. It is defined as the ratio of the transverse diameter (the horizontal distance of the inside of the ribcage) and the anteroposterior diameter (the shortest distance between the vertebrae and sternum).〔(【引用サイトリンク】title=How the Haller is measured. Departament of Cardiology and Pulmonology of the Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo – Thoracic Surgery Sector )〕 It is of diagnostic use ''in vivo''. : where: : HI is the Haller Index : ''distance 1'' is the distance of the inside ribcage (at the level of maximum deformity or at the lower third of the sternum) : ''distance 2'' is the distance between the sternal notch and vertebrae. A normal Haller index should be about 2.5. Chest wall deformities such as pectus excavatum can cause the sternum to invert, thus increasing the index, which can reach 3.25 or even as high as 5.5 ==See also== *Pectus carinatum *Nuss procedure 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Haller index」の詳細全文を読む スポンサード リンク
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