# DICOM element constraints
<a name="dicom-element-constraints"></a>

When importing your medical imaging data into AWS HealthImaging, max length constraints are applied to the following DICOM elements. To achieve a successful import, ensure that your data does not exceed the max length constraints.


**DICOM element constraints during import**  

| DICOM keyword | DICOM tag | Max length | 
| --- | --- | --- | 
| PatientName | (0010,0010) | 256 | 
| PatientID | (0010,0020) | 256 | 
| PatientBirthDate | (0010,0030) | 18 | 
| PatientSex | (0010,0040) | 16 | 
| StudyInstanceUID | (0020,000D) | 256 | 
| StudyID | (0020,0010) | 256 | 
| StudyDescription | (0008,1030) | 256 | 
| NumberOfStudyRelatedSeries | (0020,1206) | 1,000,000 | 
| NumberOfStudyRelatedInstances | (0020,1208) | 1,000,000 | 
| AccessionNumber | (0008,0050) | 256 | 
| StudyDate | (0008,0020) | 18 | 
| StudyTime | (0008,0030) | 28 | 
| SOPInstanceUID | (0008,0018) | 256 | 
| SeriesInstanceUID | (0020,000E) | 256 |