DICOM：SOPInstanceUID标签有什么意义？ [英] DICOM: What's the point of SOPInstanceUID tag?

问题描述

DICOM已经为该系列提供了足够的唯一标识符（例如 系列实例UID ），为什么还要在较低级别的对象中包含一个（例如 SOPInstanceUID ）？

DICOM already provides a unique enough identifier for the Series (e.g. Series Instance UID), so why also include one on the lower level objects (e.g. SOPInstanceUID)?

我发现真正令人烦恼的事实是，当引用其他对象时-例如，当 RTPlan 对象引用 RTStruct 通过 ReferencedStructureSetSequence / ReferencedSOPInstanceUID -使用 SOP实例UID 完成。但是，任何DICOM SCP（例如查找/移动）都不能与 SOP实例UID 一起使用，它们可以与系列实例UID一起使用。那有什么呢？我是否必须加载整个 Series 来查找所有引用的对象？

What I find really annoying is the fact that when referencing other objects - for example when RTPlan object references RTStruct object via ReferencedStructureSetSequence / ReferencedSOPInstanceUID - it's done using the SOP Instance UID. However any of the DICOM SCPs - such as find/move - don't work with SOP Instance UID, they work with the Series Instance UID. So what gives? Do I have to load the whole Series to find all the referenced objects?

推荐答案

您可能知道，DICOM具有每个单独的SOP（服务对象对）实例（患者ID /研究实例UID /系列实例UID / SOP实例UID）的标识符层次结构。此层次结构内置于DICOM的查询/检索机制中，还用于标识特定的SOP实例。

As you probably know, DICOM has a hierarchy of identifiers for each individual SOP (Service Object Pair) Instance (Patient ID / Study Instance UID / Series Instance UID / SOP Instance UID). This hierarchy is built into the Query/Retrieve mechanism in DICOM, and is also used to identify specific SOP Instances.

在您提到的特定情况下，我相信系列/研究中可能有多个RT结构集。必须引用单个SOP实例，以便您知道RT计划所引用的结构集。

In the specific case you're mentioning, I believe there could be the possibility of multiple RT Structure Sets within a Series/Study. The individual SOP Instance must be referenced so that you know which Structure Set the RT Plan is referencing.

对于支持通过SOP实例UID进行检索的产品，不幸的是，关系查询是正如您所发现的那样，DICOM查询/检索SCP中并未得到广泛支持，并且某些DICOM服务器不支持图像级查询。在这种特定情况下，您可以在系列级别专门查询RTSTRUCT模态，并且仅检索具有该模态的系列，从而将需要下载的数据范围缩小到仅RT结构集。

As for products supporting retrieving by SOP Instance UID, unfortunately, relational queries are not widely supported in DICOM Query/Retrieve SCPs, as you've discovered, and some DICOM servers do not support Image level queries. In this specific case, you could query at the series level specifically for the RTSTRUCT modality, and only retrieve the Series that have this modality, thus narrowing down which data you need to download to just the RT Structure Sets.

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