## Definition of a DICOM instance

A DICOM instance represents a single DICOM image and related metadata that are part of a DICOM series.

## Elements

| Name                       | Required | Type       | Description                                                                                          |
|----------------------------|----------|------------|------------------------------------------------------------------------------------------------------|
| sopClassUid                |          | id         | SOP Class UID<br>Details<br>The SOP Class UID of the DICOM instance.                                |
| sopInstanceUid             |          | id         | SOP Instance UID<br>Details<br>The SOP Instance UID of the DICOM instance.                          |
| instanceAvailability        |          | code       | Instance Availability<br>Details<br>The availability of the DICOM instance.                          |
| timezoneOffsetFromUtc      |          | string     | Timezone Offset From UTC<br>Details<br>The timezone offset from UTC for the study (e.g., -0700).  |
| instanceNumber             |          | string     | Instance Number<br>Details<br>The number of the instance in the study.                              |
| rows                       |          | unsignedInt| Rows<br>Details<br>The number of rows in the image.                                                |
| columns                    |          | unsignedInt| Columns<br>Details<br>The number of columns in the image.                                          |
| bitsAllocated              |          | unsignedInt| Bits Allocated<br>Details<br>The number of bits allocated for each pixel.                           |
| numberOfFrames             |          | string     | Number of Frames<br>Details<br>The number of frames in the image.                                   |

## Search Parameters

| Name                  | Type   | Description                                     | Expression                        |
|-----------------------|--------|-------------------------------------------------|-----------------------------------|
| sop-class-uid         | string | The SOP Class UID of the DICOM instance         | DicomInstance.sopClassUid        |
| sop-instance-uid      | string | The SOP Instance UID of the DICOM instance      | DicomInstance.sopInstanceUid     |
| instance-number        | string | The instance number of the DICOM instance       | DicomInstance.instanceNumber      |

## Inherited Elements

| Name                   | Required | Type                                 | Description                                                                                          |
|------------------------|----------|--------------------------------------|------------------------------------------------------------------------------------------------------|
| id                     |          | string                               | Logical id of this artifact<br>Details<br>The logical id of the resource, as used in the URL for the resource. Once assigned, this value never changes. |
| meta                   |          | [Meta](/content/docs/api/fhir/datatypes/meta/index.html)     | Details<br>The metadata about the resource. This is content that is maintained by the infrastructure. Changes to the content might not always be associated with version changes to the resource. |
| implicitRules          |          | uri                                  | Details<br>A reference to a set of rules that were followed when the resource was constructed, and which must be understood when processing the content. Often, this is a reference to an implementation guide that defines the special rules along with other profiles etc. |
| language               |          | code                                 | Details<br>The base language in which the resource is written.                                       |
| text                   |          | [Narrative](/content/docs/api/fhir/datatypes/narrative/index.html) | Text summary of the resource, for human interpretation<br>Details<br>A human-readable narrative that contains a summary of the resource and can be used to represent the content of the resource to a human. The narrative need not encode all the structured data, but is required to contain sufficient detail to make it "clinically safe" for a human to just read the narrative. Resource definitions may define what content should be represented in the narrative to ensure clinical safety. |
| contained              |          | Resource[]                           | Details<br>These resources do not have an independent existence apart from the resource that contains them - they cannot be identified independently, and nor can they have their own independent transaction scope.
| extension              |          | [Extension](/content/docs/api/fhir/datatypes/extension/index.html)[] | Additional content defined by implementations<br>Details<br>May be used to represent additional information that is not part of the basic definition of the resource. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. |
| modifierExtension      |          | [Extension](/content/docs/api/fhir/datatypes/extension/index.html)[] | Extensions that cannot be ignored<br>Details<br>May be used to represent additional information that is not part of the basic definition of the resource and that modifies the understanding of the element that contains it and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.<br>Modifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself). |