Respiratory self-gated 3D UTE for lung imaging in small animal MRI
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Respiratory self-gated 3D UTE for lung imaging in small animal MRI. / Tibiletti, Marta; Bianchi, Andrea; Kjørstad, Åsmund; Wundrak, Stefan; Stiller, Detlef; Rasche, Volker.
In: MAGN RESON MED, Vol. 78, No. 2, 10.2017, p. 739-745.Research output: SCORING: Contribution to journal › SCORING: Journal article › Research › peer-review
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TY - JOUR
T1 - Respiratory self-gated 3D UTE for lung imaging in small animal MRI
AU - Tibiletti, Marta
AU - Bianchi, Andrea
AU - Kjørstad, Åsmund
AU - Wundrak, Stefan
AU - Stiller, Detlef
AU - Rasche, Volker
N1 - © 2016 International Society for Magnetic Resonance in Medicine.
PY - 2017/10
Y1 - 2017/10
N2 - PURPOSE: To investigate retrospective respiratory gating of three-dimensional ultrashort echo time (3D UTE) lung acquisition in free-breathing rats using k-space center self gating signal (DC-SG) and 3D image-based SG (3D-Img-SG).METHODS: Seven rats were investigated with a quasi-random 3D UTE protocol. Low-resolution time-resolved sliding-window images were reconstructed with a 3D golden-angle radial sparse parallel (GRASP) reconstruction to extract a 3D-Img-SG signal, whereas DC-SG was extracted from the center of k-space. Both signals were sorted into 10 respiratory bins. Signal-to-noise ratio (SNR) and normalized signal intensity (NSI) in lung parenchyma, image sharpness, and lung volume changes were studied in the resulting images to show feasibility of the method. An algorithm for bulk movement identification and removal was implemented.RESULTS: Three-dimensional Img-SG allows reconstruction of different respiratory stages in all acquired datasets, showing clear differences in diaphragm position and significantly different lung volumes, SNR, and NSI in lung parenchyma. Improved sharpness in expiration images was observed compared to ungated images. DC-SG did not result in clear different diaphragm position in all cases. Bulk motion removal improved final image sharpness.CONCLUSION: Low-resolution 3D GRASP reconstruction allowed for extraction of an effective gating signal for 3D-Img-SG. The DC-SG method did not work in cases for which respiratory frequencies were inconsistent. Magn Reson Med, 2016. © 2016 International Society for Magnetic Resonance in Medicine.
AB - PURPOSE: To investigate retrospective respiratory gating of three-dimensional ultrashort echo time (3D UTE) lung acquisition in free-breathing rats using k-space center self gating signal (DC-SG) and 3D image-based SG (3D-Img-SG).METHODS: Seven rats were investigated with a quasi-random 3D UTE protocol. Low-resolution time-resolved sliding-window images were reconstructed with a 3D golden-angle radial sparse parallel (GRASP) reconstruction to extract a 3D-Img-SG signal, whereas DC-SG was extracted from the center of k-space. Both signals were sorted into 10 respiratory bins. Signal-to-noise ratio (SNR) and normalized signal intensity (NSI) in lung parenchyma, image sharpness, and lung volume changes were studied in the resulting images to show feasibility of the method. An algorithm for bulk movement identification and removal was implemented.RESULTS: Three-dimensional Img-SG allows reconstruction of different respiratory stages in all acquired datasets, showing clear differences in diaphragm position and significantly different lung volumes, SNR, and NSI in lung parenchyma. Improved sharpness in expiration images was observed compared to ungated images. DC-SG did not result in clear different diaphragm position in all cases. Bulk motion removal improved final image sharpness.CONCLUSION: Low-resolution 3D GRASP reconstruction allowed for extraction of an effective gating signal for 3D-Img-SG. The DC-SG method did not work in cases for which respiratory frequencies were inconsistent. Magn Reson Med, 2016. © 2016 International Society for Magnetic Resonance in Medicine.
U2 - 10.1002/mrm.26463
DO - 10.1002/mrm.26463
M3 - SCORING: Journal article
C2 - 27663453
VL - 78
SP - 739
EP - 745
JO - MAGN RESON MED
JF - MAGN RESON MED
SN - 0740-3194
IS - 2
ER -