尝试获取 DicomDataset 时获取 "DicomTag doesn't support values"

Question

升级到 fo-dicom 4.0 后，我在尝试从 DICOMDIR 文件获取 DicomDataset 时开始出现 DicomDataException: 'DicomTag doesn't support values'。

代码如下：

var dicomDirectory = await DicomDirectory.OpenAsync(dicomdirPath);
foreach (var patientRecord in dicomDirectory.RootDirectoryRecordCollection)
{
    foreach (var studyRecord in patientRecord.LowerLevelDirectoryRecordCollection)
    {
        foreach (var seriesRecord in studyRecord.LowerLevelDirectoryRecordCollection)
        {
            foreach (var imageRecord in seriesRecord.LowerLevelDirectoryRecordCollection)
            {
                //this is the problematic line
                var dicomDataset = imageRecord.GetValue<DicomSequence>(DicomTag.IconImageSequence, 0).Items.First();
                //more stuff
            }
        }
    }
}

使用以前的版本 (3.?) 我正在做 var dicomImage = imageRecord.Get<DicomSequence>(DicomTag.IconImageSequence).Items.First(); 并且工作得很好，但是升级后我收到了过时的警告，所以我将其更改为推荐的方法，即 GetValue .

如何使用当前版本的 fo-dicom 获取数据集？

Answer 1

最后，在深入研究了 fo-dicom 的 Gitter 和 GitHub 问题之后（以及 in the comments as well), I found that in 4.0 we should use GetSequence(DicomTag.IconImageSequence) instead of GetValue<DicomSequence>(DicomTag.IconImageSequence): when retrieving Sequences, using GetValue will throw. Several other Get methods have been added, such as GetValueOrDefault, GetValues<T> instead of GetValue<T[]>, and more, as can be seen in the project's Dataset test。

此外，作为推论，我还发现 4.0 中另一个 API 与先前版本不兼容（我将 post 放在这里以防有人升级并迷失在更改中）：在处理 DicomImage 时，我们不应该访问它的 .Dataset 来检索值，因为它也已被弃用。相反，我们应该存储对创建 DicomImage 的数据集的引用，以便检索标签值。

尝试获取 DicomDataset 时获取 "DicomTag doesn't support values"

Getting "DicomTag doesn't support values" when trying to obtain DicomDataset

c#

dicom

fo-dicom