[Insight-users] Image Directions

[Bill Lorensen]

Usually, the scans are landmarked in the clinic in a consistent way.

On Thu, Apr 14, 2011 at 4:45 PM, Neil Panjwani <paniwani at gmail.com> wrote:
> But how do I ensure that the lung is always close to z=0? Is there a default
> dicom orientation?
>
> On Thu, Apr 14, 2011 at 4:40 PM, Bill Lorensen <bill.lorensen at gmail.com>
> wrote:
>>
>> I would not use ITK_COORDINATE_ORIENTATION_LAI nor the orient image
>> filter. ITK operations on image should properly treat the dicom image
>> direction.
>>
>> On Thu, Apr 14, 2011 at 4:33 PM, paniwani <paniwani at gmail.com> wrote:
>> > I have a few questions about orienting images. I have several CT
>> > datasets
>> > both prone and supine. In order to do some colon segmentation I reorient
>> > so
>> > that the lung is closest to slice 0 and the spine is at the top of the
>> > image. This is done using the orient image filter in ITK with the
>> > ITK_COORDINATE_ORIENTATION_LAI code.
>> >
>> > Does changing this orientation directly change the image direction
>> > cosines?
>> > Are spatial orientation codes and direction cosines just two ways of
>> > saying
>> > the same thing?
>> >
>> > If after orienting the image in this way, I want to allocate new helper
>> > images, should I set their directions to the input's direction? Is the
>> > default image direction of an allocated image the identity matrix?
>> >
>> > Thanks in advance.
>> >
>> > Neil
>> >
>> > --
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