Octet Stream Base64

The DICOM Value Representation (VR) is included in each DICOM JSON Model attribute object and named 'vr'. For example:

The JSON encoding of an Attribute shall use the JSON Data Type corresponding to the DICOM Value Representations in Table F.2.3-1. The JSON encodings shall conform to the Definition, Character Repertoire (if applicable) and Length of Value specified for that DICOM Value Representation (see Section 6.2 “Value Representation (VR)” in PS3.5) with the following exceptions:

  • Attributes with a Value Representation of AT shall be restricted to eight character uppercase hexadecimal representation of a DICOM Tag

  • Hi, There seems to be an issue with displaying attachments in the latest TB builds (Lanikai 3.1b2pre). An attachment with a content type header of.
  • Base64 is a group of similar binary-to-text encoding schemes that represent binary data in an ASCII string format by translating it into a radix-64 representation. The term Base64 originates from a specific MIME content transfer encoding.
  • This might be something else to look at, but maybe an options: string contentType = System.Web.MimeMapping.GetMimeMapping(fileName).
Octet

Table F.2.3-1. DICOM VR to JSON Data Type Mapping

VR Name

Type

JSON Data Type

AE

Application Entity

String

AS

Age String

String

AT

Attribute Tag

String

CS

Code String

String

DA

Date

String

DS

Decimal String

Number or String

See note.

DT

Date Time

String

FL

Floating Point Single

Number

FD

Floating Point Double

Number

IS

Integer String

Number or String

See note.

LO

Long String

String

LT

Long Text

String

OB

Other Byte

Base64 encoded octet-stream

OD

Other Double

Base64 encoded octet-stream

OF

Other Float

Base64 encoded octet-stream

OL

Other Long

Base64 encoded octet-stream

OV

Other 64-bit Very Long

Base64 encoded octet-stream

OW

Other Word

Base64 encoded octet-stream

PN

Person Name

Object containing Person Name component groups as strings (see Section F.2.2)

SH

Short String

String

SL

Signed Long

Number

SQ

Sequence of Items

Array containing DICOM JSON Objects

SS

Signed Short

Number

ST

Short Text

String

SV

Signed 64-bit Very Long

Number or String

See Note.

TM

Time

String

UC

Unlimited Characters

String

UI

Unique Identifier (UID)

String

UL

Unsigned Long

Number

UN

Unknown

Base64 encoded octet-stream

UR

Universal Resource Identifier or Universal Resource Locator (URI/URL)

String

US

Unsigned Short

Number

UT

Unlimited Text

String

UV

Unsigned 64-bit Very Long

Number or String.

See Note.


Note

Handle content types in Azure Logic Apps.; 5 minutes to read; e; j; i; c; M; In this article. Various content types can flow through a logic app, for example, JSON, XML, flat files, and binary data.

Octet stream to base64 nodejs

For IS, DS, SV and UV, a JSON String representation can be used to preserve the original format during transformation of the representation, or if needed to avoid losing precision of a decimal string.

Octet Stream To Base64 Nodejs

Although data, such as dates, are represented in the DICOM JSON model as strings, it is expected that they will be treated in the same manner as the original attribute as defined by Chapter 6 in PS3.6.

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I was recently conducting a training on Power Automate and there in came this question. How do I convert a byte array to base64 string in PowerApps.
After all there is a function in Power Automate – base64ToBinary which converts a base64 string to Binary. But there is no function like binaryToBase64 in Power Automate. If you are from C#, you would be thinking wish you had a method similar to Convert.ToBase64String in Power Automate too.
Well, I can understand the disappointment here. But frankly speaking the method is never needed. And it is because of that way Power Automate handles an incoming byte array.
For example you are reading a file from one drive and want to convert the binary file into Base64 string for further processing. You actually don’t need to. This is because when Power Automate will handle the incoming bytes, it will automatically convert the incoming bytes as Base64 with content type as “application/octet-stream”.
“$content-type”: “application/octet-stream”
And to get the content in Base64 format, you just need this expression – triggerBody()?[‘$content’]
Let’s see this with an example here.
I create a Manual trigger flow with “abcd” as my initial input parameter. Below is my flow definition
Nothing complex about the flow. Steps are explained below

  • Convert the text into base64 string using expression – base64()
  • Use the Compose operation to convert the base64 encoded string into binary using the base64ToBinary() expression.
  • In the final step I assign the Binary input to a string variable

Octet-stream Base64

Octet stream vs base64Nodejs

Octet Stream Vs Base64

Let’s see what is the final output when we start with initial input – “abcd”.
Observe the Compose step where I used base64ToBinary() expression. As you can see, that the content is actually still in base64 format but the content-type has been changed to “application/octet-stream”.
In the final step when I am using the Output from from Compose Action and assigning it to a string variable, it is actually decoding the base64 text into plain text.
And that is why there is no function like binaryToBase64. After all the content is always in base64. The content-type reflects the type of content stored internally.
Hope this helps!
Debajit Dutta
(Microsoft MVP)

Base64

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