GetImages(DicomElement,int,int,int,RasterByteOrder,DicomGetImageFlags) Method

Summary

Gets the images of a Pixel Data element.

Syntax

C++

Java

public RasterImage GetImages( 
   DicomElement element, 
   int index, 
   int count, 
   int bitsPerPixel, 
   RasterByteOrder order, 
   DicomGetImageFlags flags 
)

Public Overloads Function GetImages( _ 
   ByVal element As DicomElement, _ 
   ByVal index As Integer, _ 
   ByVal count As Integer, _ 
   ByVal bitsPerPixel As Integer, _ 
   ByVal order As RasterByteOrder, _ 
   ByVal flags As DicomGetImageFlags _ 
) As RasterImage

public RasterImage getImages(DicomElement element, int index, int count, int bitsPerPixel, int order, DicomGetImageFlags flags)

public: 
RasterImage^ GetImages(  
   DicomElement^ element, 
   int index, 
   int count, 
   int bitsPerPixel, 
   RasterByteOrder order, 
   DicomGetImageFlags flags 
)

Parameters

element
An item in the Data Set.

index
The zero-based index of the first frame to load.

count
Value that represents the number of frames to load.

bitsPerPixel
Value that represents the resulting image pixel depth. Possible values are:

Value	Meaning
0	Keep the original file's pixel depth (do not convert).
1 to 8	Use the specified bits per pixel in the resulting image.
12	Use 12 bits per pixel in the resulting image.
16	Use 16 bits per pixel in the resulting image.
24	Use 24 bits per pixel in the resulting image.
32	Use 32 bits per pixel in the resulting image.

order
This value is ignored.

flags
Flags that control the behavior of this method.

Return Value

The images of a Pixel Data element.

Remarks

As an example, if you wish to load 50 images starting with the 50th frame in the Pixel Data, call this method with index set to 49 (the 50th frame in a zero-based index) and count set to 50. If element is null, you can retrieve all images within the Data Set. To do this you must call GetImageCount with the element parameter set to null to determine the number of images in the Data Set and then set the count parameter in GetImages to this value.

If DicomGetImageFlags.AllowRangeExpansion is set in [flags](" id="flagsparameterlink" class="popuplink.html), consider the following example:

If the Data Set has the following attributes:

Bits allocated 16

Bits stored 12

Pixel Range 0 - +4095

Pixel Representation is unsigned (0)

Photometric Interpretation is MONOCHROME2

Rescale Slope 1

Rescale Intercept -1024

After applying the rescale slope and the intercept:

Output minimum pixel value = (0 * 1 +(-1024)) = -1024

Output maximum pixel value = (4095 * 1 + (-1024)) = 3071

The new pixel value range (-1024 to 3071) cannot be represented with the current bits stored (12 bits), which can represent values in the range (-2048 to 2048). In this case the method will change the high bit inside the image object to be 12 instead of 11 (bits stored becomes 13), which can represent values in the range (-8192 to 8191).

Please note that the method will not be able to update the high bit and/or low bit if the number of bits stored was already equal to the number of bits allocated.

If the DICOM dataset has a Multi-frame Functional Groups module, some VOI LUT information will be read from the corresponding Frame VOI LUT Sequence, and some Modality LUT information will be read from the corresponding Pixel Value Transformation Sequence. The specific elements that are read are shown below: (0028,9132) Frame VOI LUT Sequence Child Elements