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（NHANES），由美国疾病控制与预防中心的国家健康统计中心（NCHS/CDC）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健康与营养状况。

该调查包含17,000张NHANES图像，支持以下格式：
jpg - 完整空间分辨率和8位灰度
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）和后续非锐化掩模的jpg
tif8 - 以TIFF格式提供的完整空间分辨率和8位灰度分辨率
tif8roi - 颈椎脊柱图像的小部分以完整空间分辨率和8位灰度提供，裁剪到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位灰度分辨率提供，以原始“nh2”格式存储，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

这些图像是第二次国家健康与营养状况调查（NHANES II）期间收集的17,000张X光片的光学数字化版本，该调查由NCHS在1976-1980年期间进行。在NHANES II中，20,322名个体接受了访谈和检查。对于25至74岁的受检者，进行了两张X光片拍摄，例外情况为孕妇不拍摄X光片，以及50岁以下女性不拍摄腰椎X光片。拍摄颈椎和腰椎脊柱X光片以提供骨关节炎和退行性椎间盘病变的证据。

随后，这些X光片使用Lumisys激光扫描设备以水平和垂直采样率为146 dpi进行数字化。

NHANES X光片由加州大学洛杉矶分校和加州大学旧金山分校的Bernie Huang博士进行扫描。Huang博士的研究小组使用Lumysis 100和175微米的光点扫描前6000张X光片。剩余的X光片再次使用Lumysis 150进行扫描，光点大小为175微米。

注意：该数据集不再更新新内容。