Scanner attribute for the k-space data

[NebiyouTen]

Hello!

Is there information available regarding which scanner was used for the samples, such as 3T versus 1.5T systems?

Thanks in advance.

[mmuckley]

Hello @NebiyouTen, yes you can get this information.

import h5py
from lxml import etree

hf = h5py.File("file1001067.h5", "r")
root = etree.fromstring(hf['ismrmrd_header'][()])
print(etree.tostring(root, pretty_print=True).decode())

Output:

<ismrmrdHeader xmlns="http://www.ismrm.org/ISMRMRD" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xs="http://www.w3.org/2001/XMLSchema" xsi:schemaLocation="http://www.ismrm.org/ISMRMRD ismrmrd.xsd">
	<studyInformation>
		<studyTime>19:43:20</studyTime>
	</studyInformation>
	<measurementInformation>
		<measurementID>45167_61209532_61209541_9702</measurementID>
		<patientPosition>FFS</patientPosition>
		<protocolName>COR</protocolName>
		<frameOfReferenceUID>1.3.12.2.1107.5.2.19.45167.1.20180322193406964.0.0.0</frameOfReferenceUID>
	</measurementInformation>
	<acquisitionSystemInformation>
		<systemVendor>SIEMENS</systemVendor>
		<systemModel>Skyra</systemModel>
		<systemFieldStrength_T>2.893620</systemFieldStrength_T>
		<relativeReceiverNoiseBandwidth>0.793000</relativeReceiverNoiseBandwidth>
		<receiverChannels>15</receiverChannels>
		<coilLabel>
			<coilNumber>42</coilNumber>
			<coilName>TxRx_15Ch_Knee:1:K5</coilName>
		</coilLabel>
		<coilLabel>
			<coilNumber>41</coilNumber>
			<coilName>TxRx_15Ch_Knee:1:K15</coilName>
		</coilLabel>
		<coilLabel>
			<coilNumber>26</coilNumber>
			<coilName>TxRx_15Ch_Knee:1:K9</coilName>
		</coilLabel>
		<coilLabel>
			<coilNumber>25</coilNumber>
			<coilName>TxRx_15Ch_Knee:1:K4</coilName>
		</coilLabel>
		<coilLabel>
			<coilNumber>30</coilNumber>
			<coilName>TxRx_15Ch_Knee:1:K7</coilName>
		</coilLabel>
		<coilLabel>
			<coilNumber>29</coilNumber>
			<coilName>TxRx_15Ch_Knee:1:K8</coilName>
		</coilLabel>
		<coilLabel>
			<coilNumber>46</coilNumber>
			<coilName>TxRx_15Ch_Knee:1:K1</coilName>
		</coilLabel>
		<coilLabel>
			<coilNumber>18</coilNumber>
			<coilName>TxRx_15Ch_Knee:1:K6</coilName>
		</coilLabel>
		<coilLabel>
			<coilNumber>17</coilNumber>
			<coilName>TxRx_15Ch_Knee:1:K14</coilName>
		</coilLabel>
		<coilLabel>
			<coilNumber>22</coilNumber>
			<coilName>TxRx_15Ch_Knee:1:K10</coilName>
		</coilLabel>
		<coilLabel>
			<coilNumber>21</coilNumber>
			<coilName>TxRx_15Ch_Knee:1:K13</coilName>
		</coilLabel>
		<coilLabel>
			<coilNumber>34</coilNumber>
			<coilName>TxRx_15Ch_Knee:1:K3</coilName>
		</coilLabel>
		<coilLabel>
			<coilNumber>33</coilNumber>
			<coilName>TxRx_15Ch_Knee:1:K2</coilName>
		</coilLabel>
		<coilLabel>
			<coilNumber>38</coilNumber>
			<coilName>TxRx_15Ch_Knee:1:K12</coilName>
		</coilLabel>
		<coilLabel>
			<coilNumber>37</coilNumber>
			<coilName>TxRx_15Ch_Knee:1:K11</coilName>
		</coilLabel>
		<institutionName>NYU</institutionName>
	</acquisitionSystemInformation>
	<experimentalConditions>
		<H1resonanceFrequency_Hz>123239222</H1resonanceFrequency_Hz>
	</experimentalConditions>
	<encoding>
		<encodedSpace>
			<matrixSize>
				<x>640</x>
				<y>368</y>
				<z>1</z>
			</matrixSize>
			<fieldOfView_mm>
				<x>280.000000</x>
				<y>161.419998</y>
				<z>4.500000</z>
			</fieldOfView_mm>
		</encodedSpace>
		<reconSpace>
			<matrixSize>
				<x>320</x>
				<y>320</y>
				<z>1</z>
			</matrixSize>
			<fieldOfView_mm>
				<x>140.000000</x>
				<y>140.000000</y>
				<z>3.000000</z>
			</fieldOfView_mm>
		</reconSpace>
		<encodingLimits>
			<kspace_encoding_step_1>
				<minimum>0</minimum>
				<maximum>331</maximum>
				<center>166</center>
			</kspace_encoding_step_1>
			<kspace_encoding_step_2>
				<minimum>0</minimum>
				<maximum>0</maximum>
				<center>0</center>
			</kspace_encoding_step_2>
			<average>
				<minimum>0</minimum>
				<maximum>0</maximum>
				<center>0</center>
			</average>
			<slice>
				<minimum>0</minimum>
				<maximum>36</maximum>
				<center>0</center>
			</slice>
			<contrast>
				<minimum>0</minimum>
				<maximum>0</maximum>
				<center>0</center>
			</contrast>
			<phase>
				<minimum>0</minimum>
				<maximum>0</maximum>
				<center>0</center>
			</phase>
			<repetition>
				<minimum>0</minimum>
				<maximum>0</maximum>
				<center>0</center>
			</repetition>
			<set>
				<minimum>0</minimum>
				<maximum>0</maximum>
				<center>0</center>
			</set>
			<segment>
				<minimum>0</minimum>
				<maximum>0</maximum>
				<center>0</center>
			</segment>
		</encodingLimits>
		<trajectory>cartesian</trajectory>
		<parallelImaging>
			<accelerationFactor>
				<kspace_encoding_step_1>1</kspace_encoding_step_1>
				<kspace_encoding_step_2>1</kspace_encoding_step_2>
			</accelerationFactor>
			<calibrationMode>other</calibrationMode>
		</parallelImaging>
	</encoding>
	<sequenceParameters>
		<TR>2750.000000</TR>
		<TE>27.000000</TE>
		<TI>100.000000</TI>
		<flipAngle_deg>140.000000</flipAngle_deg>
		<sequence_type>TurboSpinEcho</sequence_type>
		<echo_spacing>8.850000</echo_spacing>
	</sequenceParameters>
	<userParameters>
		<userParameterDouble>
			<name>MaxwellCoefficient_0</name>
			<value>0.000000</value>
		</userParameterDouble>
		<userParameterDouble>
			<name>MaxwellCoefficient_1</name>
			<value>0.000000</value>
		</userParameterDouble>
		<userParameterDouble>
			<name>MaxwellCoefficient_2</name>
			<value>0.000000</value>
		</userParameterDouble>
		<userParameterDouble>
			<name>MaxwellCoefficient_3</name>
			<value>0.000000</value>
		</userParameterDouble>
		<userParameterDouble>
			<name>MaxwellCoefficient_4</name>
			<value>0.000000</value>
		</userParameterDouble>
		<userParameterDouble>
			<name>MaxwellCoefficient_5</name>
			<value>0.000000</value>
		</userParameterDouble>
		<userParameterDouble>
			<name>MaxwellCoefficient_6</name>
			<value>0.000000</value>
		</userParameterDouble>
		<userParameterDouble>
			<name>MaxwellCoefficient_7</name>
			<value>0.000000</value>
		</userParameterDouble>
		<userParameterDouble>
			<name>MaxwellCoefficient_8</name>
			<value>0.000000</value>
		</userParameterDouble>
		<userParameterDouble>
			<name>MaxwellCoefficient_9</name>
			<value>0.000000</value>
		</userParameterDouble>
		<userParameterDouble>
			<name>MaxwellCoefficient_10</name>
			<value>0.000000</value>
		</userParameterDouble>
		<userParameterDouble>
			<name>MaxwellCoefficient_11</name>
			<value>0.000000</value>
		</userParameterDouble>
		<userParameterDouble>
			<name>MaxwellCoefficient_12</name>
			<value>0.000000</value>
		</userParameterDouble>
		<userParameterDouble>
			<name>MaxwellCoefficient_13</name>
			<value>0.000000</value>
		</userParameterDouble>
		<userParameterDouble>
			<name>MaxwellCoefficient_14</name>
			<value>0.000000</value>
		</userParameterDouble>
		<userParameterDouble>
			<name>MaxwellCoefficient_15</name>
			<value>0.000000</value>
		</userParameterDouble>
	</userParameters>
</ismrmrdHeader>

You can see this file is from a 3T Skyra scanner. Please see the use of the et_query function here for how to get individual values programmatically from the header.

[NebiyouTen]

Perfect! Thank you!

[mmuckley]

(Reopening this so it's on the list of the discussions in case others search for it.)