I got an MRI raw data. Now how do I convert it to an MRI image?

These are the current steps that I follow :
1. translation of data to
	R = input[i]*Cos((2*pi*f)*n/N)
	I = input[i]*Sin((2*pi*f)*n/N)
2. Zero pad the R and I data to reach data size allowable for FFT
3. perform a Horizontal then a Vertical FFT
4. get the absolute value of R and I


Unfortunately, all I get is NO Image.


Anything I missed here??

also there are parameters that makes no sense to me, sampling rate, AD 
samples, taps.
I understand thet qd points and qd cycle are used for the cosine and 
sine tables.
Thanks

Jeff

It is my understanding that the MRI uses the Radon transform for image
projection.  Therefor you need the inverse Radon transform.  Do a
google search on radon transform.  There are some good papers there.

Maurice Givens


"Jefferson O. Siy" <jeffsiy@pacific.net.ph> wrote in message news:<bolr7v$ri2$1@nobel2.pacific.net.sg>...
> I got an MRI raw data. Now how do I convert it to an MRI image?
> 
> These are the current steps that I follow :
> 1. translation of data to
> 	R = input[i]*Cos((2*pi*f)*n/N)
> 	I = input[i]*Sin((2*pi*f)*n/N)
> 2. Zero pad the R and I data to reach data size allowable for FFT
> 3. perform a Horizontal then a Vertical FFT
> 4. get the absolute value of R and I
> 
> 
> Unfortunately, all I get is NO Image.
> 
> 
> Anything I missed here??
> 
> also there are parameters that makes no sense to me, sampling rate, AD 
> samples, taps.
> I understand thet qd points and qd cycle are used for the cosine and 
> sine tables.
> Thanks
> 
> Jeff

Thanks for the info Maurice.
after a lot of testing...I got the image.
it has something to do with the resampling filter that downsamples the 
data to a size that can be proecessed by FFT.
Thanks again

Jeff

Maurice Givens wrote:
> It is my understanding that the MRI uses the Radon transform for image
> projection.  Therefor you need the inverse Radon transform.  Do a
> google search on radon transform.  There are some good papers there.
> 
> Maurice Givens
> 
> 
> "Jefferson O. Siy" <jeffsiy@pacific.net.ph> wrote in message news:<bolr7v$ri2$1@nobel2.pacific.net.sg>...
> 
>>I got an MRI raw data. Now how do I convert it to an MRI image?
>>
>>These are the current steps that I follow :
>>1. translation of data to
>>	R = input[i]*Cos((2*pi*f)*n/N)
>>	I = input[i]*Sin((2*pi*f)*n/N)
>>2. Zero pad the R and I data to reach data size allowable for FFT
>>3. perform a Horizontal then a Vertical FFT
>>4. get the absolute value of R and I
>>
>>
>>Unfortunately, all I get is NO Image.
>>
>>
>>Anything I missed here??
>>
>>also there are parameters that makes no sense to me, sampling rate, AD 
>>samples, taps.
>>I understand thet qd points and qd cycle are used for the cosine and 
>>sine tables.
>>Thanks
>>
>>Jeff