[Mristudio-users] adc artifacts

[susumu mori]

Oh, I see. Our sample data are very old. Please don't worry about it if you
are just practicing the software.
It was caused by poor calibration of the scanner back then. It's not
because something is wrong with your calculation.

On Thu, Feb 21, 2013 at 9:19 PM, Durai Arasan <durai23 at gmail.com> wrote:

> thanks Dr Mori, but the data is from the mristudio tutorial. so i am
> definitely wrong somewhere. increasing the threshold seems to get rid of
> the artifacts but i am losing information as well.
>
> maybe i should use a image mask while calculating ADC?
>
>
> On Thu, Feb 21, 2013 at 9:02 PM, susumu mori <susumu at mri.jhu.edu> wrote:
>
>> If this artifact appears reproducible, you'd better contact your scanner
>> manufacturer and show the image.
>> This half-field-of-view ghost is usually caused by poor calibration scan
>> and phase correction for the EPI data acquisition. We always have this
>> ghost in DTI, which uses EPI, but with much less degree.
>>
>> On Thu, Feb 21, 2013 at 8:42 PM, Durai Arasan <durai23 at gmail.com> wrote:
>>
>>> hi,
>>>
>>> just started using this amazing software.
>>>
>>> my adc map has consistent artifacts (calculated with b-val = 700 thresh
>>> = 10) as shown in attached image.
>>>
>>> this is probably something trivial, as i am using the sample data
>>> provided in the tutorial with default values. can someone point out whats
>>> wrong?
>>>
>>> thanks
>>> durai
>>>
>>>
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>>
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>
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