Partial fourier representation

[roshtha]

Hi,

When I convert a siements .dat file to ismrmrd format, I get the following values in xml_pre.xml

<sKSpace>
            <lBaseResolution>320</lBaseResolution>
            <lPhaseEncodingLines>270</lPhaseEncodingLines>
            <lPartitions>24</lPartitions>
            <dPhaseResolution>0.83</dPhaseResolution>
            <dSliceResolution>1</dSliceResolution>
            <ucTrajectory>1</ucTrajectory>
            <lImagesPerSlab>16</lImagesPerSlab>
            <dSliceOversamplingForDialog>0.5</dSliceOversamplingForDialog>
            <ucPhasePartialFourier>16</ucPhasePartialFourier>
            <ucSlicePartialFourier>16</ucSlicePartialFourier>
            <lRadialViews>64</lRadialViews>
</sKSpace>

I could not find a mapping value for ucPhasePartialFourier=16 in IsmrmrdParameterMap_Siemens.xsl.

<xsl:variable name="partialFourierPhase">
        <xsl:choose>
            <xsl:when test="siemens/MEAS/sKSpace/ucPhasePartialFourier = 1">0.5</xsl:when>
            <xsl:when test="siemens/MEAS/sKSpace/ucPhasePartialFourier = 2">0.625</xsl:when>
            <xsl:when test="siemens/MEAS/sKSpace/ucPhasePartialFourier = 4">0.75</xsl:when>
            <xsl:when test="siemens/MEAS/sKSpace/ucPhasePartialFourier = 8">0.875</xsl:when>
            <xsl:otherwise>1.0</xsl:otherwise>
        </xsl:choose>
</xsl:variable>

I would like to know whether this data treated as partial fourier or fully sampled ?
In the generated ISMRMRD .h5 file, I could see only 270 acquistions and encodedSpace.matrixSize.y is 320.

Thanks all!

[hansenms]

This is being treated as fully sampled. Not sure if that is correct for your sequence. But as you can see it maps to 1.0