McCullough E C
Radiology. 1978 Dec;129(3):765-8. doi: 10.1148/129.3.765.
CT can provide detailed 3-dimensional representation of diseased and dose-limiting structures; it detects lung metastases and may be of use in follow-up studies. The potential use of the electron density cross section may be limited by (a) the small number of planning situations where inhomogeneity corrections are truly useful, (b) the lack of sensitivity of certain correction schemes (e.g., megavoltage photons), (c) the inherent inaccuracy of certain correction schemes, (d) the inaccuracy of in vivo determinations of electron density and (e) the narrow range of electron densities observed in most soft tissues of the body.
CT能够提供病变结构和剂量限制结构的详细三维图像；它可检测肺转移灶，并且在随访研究中可能有用。电子密度截面的潜在用途可能受到以下因素限制：（a）真正需要进行不均匀性校正的计划情况数量较少；（b）某些校正方案（例如兆伏光子）缺乏敏感性；（c）某些校正方案存在固有不准确性；（d）体内电子密度测定不准确；（e）在人体大多数软组织中观察到的电子密度范围较窄。
