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The uptake of 99mTc- labeled DTPA-SPION MBs was observed in the lungs 1 h post injection using SPECT, while the redistribution to the liver and kidneys was seen on SPECT-MR images 24 h post injection.
All parameters were scored on a scale of 0 to 4: 0 for normal lungs, 1 for <25% lung involvement, 2 for 25% to 50% involvement, 3 for 50% to 75% involvement, and 4 for >75% lung involvement.
The highest uptake was observed in the lungs 1 h post injection of 99mTc-labeled DTPA and chitosan MBs, while a similar distribution to the lungs and the liver was seen after the administration of PMAA MBs.
The conducting zone possesses a number of mechanisms that protect the lungs: 1. Anatomically, the repeated branching presents a defensive 'sifting' zone to 'trap' particles via inertial impaction and sedimentation while allowing inhaled gases to be humidified and warmed to body temperature.
SPECT enables the functional visualization of MBs in the lungs 1 h post injection (A) and in the liver and kidneys 24 h post injection (B), while MRI enables the visualization of an anatomical image and SPION in the liver post injection and 24 h post injection (A and B).
The SPECT and MR images were fused for rats injected with DTPA-SPION MBs (Figure 9), visualizing the concept of multimodality imaging using fusion SPECT-MRI where SPECT exclusively enables the visualization of MBs in the lungs 1 h post injection (Figure 9A) and in the liver and kidneys 24 h post injection (Figure 9B).
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Second, until recently humans have been deemed dead solely on cardiorespiratory criteria - loss of the flow of blood in the circulation or air in the lungs [ 1, 32, 33].
ECMO may correct hypoxemia but may also aid in protecting the lungs [1].
Radiolabelled MAA have been used to semi-quantitatively assess the spatial pulmonary perfusion in normal lungs [1, 16 19].
Absolute values and dynamic tidal changes of PES have been examined in the setting of healthy or symmetrically diseased lungs [1, 2].
The kidneys develop abnormally and are unable to produce urine; there is oligohydramnion and thereby, inter alia, maldevelopment of the lungs [1, 2].
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