Digitized NHANES II X-ray Films

The National Health and Nutrition Examination Surveys (NHANES), conducted by the National Center for Health Statistics, Centers for Disease Control (NCHS/CDC), were designed to assess the health and nutritional status of adults and children in the United States through interviews and direct physical examinations.

The 17,000 NHANES images are available in the following formats:

jpg - full spatial resolution and 8-bit grayscale
jpgahe – jpg with adaptive histogram equalization (AHE)
jpgaheus - jpg with adaptive histogram equalization (AHE) followed by unsharp masking
tif8 - full spatial resolution and 8-bit grayscale resolution in TIFF format
tif8roi - A small subset of the cervical spine images is available at full spatial resolution and 8-bit, cropped to regions of interest containing the spine area
fullres - The 17,000 NHANES II images at full spatial and full 12-bit grayscale resolution, in raw "nh2" format, uncompressed
marks - Vertebra coordinate values for a subset of about 600 of the images is available in ASCII text format

Information about the Second National Health and Nutrition Examination Survey (NHANES II)

These images are the digitized versions of the 17,000 x-ray films collected during the Second National Health and Nutrition Examination Survey (NHANES II) conducted by the NCHS during the years 1976-1980. In NHANES II 20,322 individuals were both interviewed and examined. For examined persons aged 25 through 74, two x-rays were made, with the exceptions that no x-rays were taken of pregnant women and no lumbar x-rays were taken on women under 50 years of age. X-rays of the cervical and lumbar spines were taken to provide evidence of osteoarthitis and degenerative disc disease.

The films were subsequently digitized at a horizontal and vertical sampling rate of 146 dpi using Lumisys laser scanning equipment.

The NHANES radiographs were scanned by Dr. Bernie Huang at the University of California at Los Angeles and the University of California at San Francisco. Dr. Huang’s group used a Lumysis 100 with a 175 micron spot to scan the first 6000 radiographs. The remaining radiographs were scanned on the Lumysis 150 again with a 175 micron spot size.

NOTE: This dataset is no-longer updated with new content.

国家健康与营养状况调查（National Health and Nutrition Examination Surveys，简称NHANES），由美国疾病控制与预防中心（Centers for Disease Control and Prevention，简称CDC）下属的国家健康统计中心（National Center for Health Statistics，简称NCHS）组织实施，旨在通过访谈和直接的身体检查来评估美国成人和儿童的身心健康状况。

该NHANES数据集中的17,000张图像支持以下格式：

jpg - 完整空间分辨率和8位灰度级
jpgahe – 带有自适应直方图均衡化（AHE）的jpg
jpgaheus - 带有自适应直方图均衡化（AHE）并随后进行锐化遮罩的jpg
tif8 - TIFF格式的完整空间分辨率和8位灰度级分辨率
tif8roi - 颈椎X光片的小部分图像以完整空间分辨率和8位灰度级提供，裁剪至包含脊柱区域的感兴趣区域
fullres - 17,000张NHANES II图像以完整空间和完整12位灰度级分辨率提供，采用原始“nh2”格式，未压缩
marks - 大约600张图像的椎骨坐标值以ASCII文本格式提供

关于第二次国家健康与营养状况调查（NHANES II）的信息

这些图像是1976年至1980年间，国家健康统计中心进行的第二次国家健康与营养状况调查（NHANES II）中收集的17,000张X光片的数字化版本。在NHANES II中，共有20,322人接受了访谈和检查。对于25至74岁的受检者，进行了两次X光检查，例外情况为：孕妇不做X光检查，50岁以下女性不做腰椎X光检查。拍摄颈椎和腰椎X光片以提供骨关节炎和退行性椎间盘疾病的证据。

随后，使用Lumisys激光扫描设备以146 dpi的水平和垂直采样率对胶片进行了数字化处理。

加州大学洛杉矶分校和加州大学旧金山分校的Bernie Huang博士对这些NHANES X光片进行了扫描。Huang博士的研究小组使用Lumysis 100扫描前6000张X光片，该设备具有175微米的斑点。剩余的X光片在Lumysis 150上进行扫描，同样使用175微米的斑点尺寸。

注意：该数据集不再更新新内容。