SoVRDicomData Class Reference
[Readers]

DICOM data. More...

#include <VolumeViz/readers/SoVRDicomData.h>

List of all members.

Public Member Functions
	SoVRDicomData ()
	~SoVRDicomData ()
SoNONUNICODE SbBool	readDicomHeader (const char *fileName)
SbBool	readDicomHeader (const SbString &fileName)
SoNONUNICODE SbBool	readDicomImage (const char *fileName)
SbBool	readDicomImage (const SbString &fileName)
SbBool	close ()
int	getNumFrames () const
int	getImageWidth () const
int	getImageHeight () const
int	getSizeInBytes () const
int	getBytesPerPixel () const
int	getSamplesPerPixel () const
SbBool	supportedTransferSyntax () const
void	readFrame (size_t frame, const SbBox2i32 &subImg, uint8_t *dst) const
const SiDicomDataSet *	getDicomDataSet () const
float	getSliceThicknessMM () const
float	getSliceSpacing () const
int	getSeriesNumber () const
int	getImageNumber () const
float	getSliceLocation () const
float	getXPixelSize () const
float	getYPixelSize () const
SbBool	getPosition (SbVec3f &position) const
SbVec3f	getImagePosition () const
SbBool	getOrientation (SbMatrix &orientation) const
int	getBitsStored () const
int	getHighBit () const
int	signedData () const
float	getIntercept () const
float	getSlope () const
SbString	getDicomInfo (unsigned short group, unsigned short element) const
Friends
class	SoVRDicomFileReader

---

Detailed Description

DICOM data.

Access data in a DICOM data set.

DICOM is a widely used format for storing medical image data (CT, MRI, etc), defined by the National Electrical Manufacturers Association (NEMA) (http://medical.nema.org).

This class can be used to directly open and query information from DICOM format files. It can also be used to get DICOM specific information from a file opened by VolumeViz (see SoVRDicomFileReader).

Note that it only returns information for a single file, not (in general) for the complete volume.

To conveniently iterate over or randomly access all the DICOM attributes, see the getDicomDataSet() method.

SEE ALSO

SoVRDicomFileReader, SiDicomDataSet

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Constructor & Destructor Documentation

SoVRDicomData::SoVRDicomData

(

)

Constructor.

SoVRDicomData::~SoVRDicomData

(

)

Destructor.

---

Member Function Documentation

SbBool SoVRDicomData::close

(

)

Closes the underlying reader.

int SoVRDicomData::getBitsStored

(

)

const

Returns the number of bits stored.

int SoVRDicomData::getBytesPerPixel

(

)

const

Returns the number of bytes per pixel.

const SiDicomDataSet* SoVRDicomData::getDicomDataSet

(

)

const

Returns a DICOM data object that allows accessing all the DICOM attributes.

Returns:

a pointer to the created data set, that must be deleted by the application. If an error occurs, returns NULL.

SbString SoVRDicomData::getDicomInfo	(	unsigned short	group,
		unsigned short	element
	)			const

Generic method to get DICOM info.

The group and element parameters should be given using the hexadecimal tag values defined by the DICOM specification. For example Rescale Slope is (0028,1053) and Rescale Intercept is (0028,1052).

• See http://medical.nema.org/
• See http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/DICOM.html

To conveniently access the DICOM attributes, see the getDicomDataSet() method.

Parameters:

	group	hexadecimal group tag value to retrieve info from.
	element	hexadecimal element tag value to retrieve info from in the group.

Returns:

value info.

int SoVRDicomData::getHighBit

(

)

const

Returns the high bit.

int SoVRDicomData::getImageHeight

(

)

const

Returns the image height.

int SoVRDicomData::getImageNumber

(

)

const

Returns the image number.

SbVec3f SoVRDicomData::getImagePosition

(

)

const

Returns the position of the first frame's top left voxel center in the patient space.

This correspond to Dicom tag ImagePositionPatient (0020, 0032) of image stack first slice.

int SoVRDicomData::getImageWidth

(

)

const

Returns the image width.

float SoVRDicomData::getIntercept

(

)

const

Returns the intercept.

int SoVRDicomData::getNumFrames

(

)

const

Returns the number of frames.

Currently an SoVRDicomData object corresponds to a single DICOM file. Therefore getNumFrames() returns the number of images in the associated DICOM file, not (in general) the number of images in the volume. Typically it returns 1 because there is a single image in the file. Note that even if the SoVRDicomData object was queried from an SoVRDicomFileReader, it does not return the number of images in the volume except in the special case where all images are stored in a single file. To get the number of images in the volume use the volume reader or SoVolumeData object.

SbBool SoVRDicomData::getOrientation

(

SbMatrix &

orientation

)

const

Returns the orientation of the DICOM volume.

This orientation can be used with a transform node, for example SoRotation It is computed from the DICOM Image Orientation Patient. If this element is not available, orientation will be set to the identity matrix.

Returns:

True if file contains orientation information.

SbBool SoVRDicomData::getPosition

(

SbVec3f &

position

)

const

Returns the 3D position of the center of the image.

This position represents the "origin" of the image in a 3D graphics sense and be used with a transform node, for example, SoTranslation. It is computed from the DICOM Image Position Patient attribute, but is not the same as the Image Position Patient (which is the position of the center of the first voxel). If this element is not available, position will be set to (0, 0, 0).

Returns:

True if file contains position

int SoVRDicomData::getSamplesPerPixel

(

)

const

Returns the number of samples per pixel.

int SoVRDicomData::getSeriesNumber

(

)

const

Returns the series number.

int SoVRDicomData::getSizeInBytes

(

)

const

Returns the image size in bytes.

float SoVRDicomData::getSliceLocation

(

)

const

Returns the image location in mm.

This is the DICOM ImagePosition transformed by the DICOM ImageOrientation.

float SoVRDicomData::getSliceSpacing

(

)

const

Returns the slice spacing.

float SoVRDicomData::getSliceThicknessMM

(

)

const

Returns the slice thickness in mm.

If the thickness information is not present in the file, will return NaN.

float SoVRDicomData::getSlope

(

)

const

Returns the slope.

float SoVRDicomData::getXPixelSize

(

)

const

Returns the X pixel size in mm.

float SoVRDicomData::getYPixelSize

(

)

const

Returns the Y pixel size in mm.

SbBool SoVRDicomData::readDicomHeader

(

const SbString &

fileName

)

Reads the DICOM file header.

Returns TRUE upon success.

SoNONUNICODE SbBool SoVRDicomData::readDicomHeader

(

const char *

fileName

)

Reads the DICOM file header.

Returns TRUE upon success.

Non Unicode List:

This function should not be used in a Unicode application.

SbBool SoVRDicomData::readDicomImage

(

const SbString &

fileName

)

Reads the DICOM image.

Returns TRUE upon success.

SoNONUNICODE SbBool SoVRDicomData::readDicomImage

(

const char *

fileName

)

Reads the DICOM image.

Returns TRUE upon success.

Non Unicode List:

This function should not be used in a Unicode application.

void SoVRDicomData::readFrame	(	size_t	frame,
		const SbBox2i32 &	subImg,
		uint8_t *	dst
	)			const

Read a region of a DICOM frame.

Parameters:

	frame	The frame to read. Note there is typically only one frame per file (see getNumFrames).
	subImg	A region of the frame to read (see getImageWidth() and getImageHeight()).
	dst	A buffer that will be filled with image data (see getSizeInBytes()).

NOTE: The application is responsible for allocating and freeing this memory.

int SoVRDicomData::signedData

(

)

const

Returns the signed flag.

SbBool SoVRDicomData::supportedTransferSyntax

(

)

const

Returns true if the transfer syntax is supported by Open Inventor.

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Friends And Related Function Documentation

friend class SoVRDicomFileReader [friend]

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The documentation for this class was generated from the following file:

• VolumeViz/readers/SoVRDicomData.h