There are special considerations to carry out lung ventilation imaging on paediatric patients. They cannot use a reservoir breathing system. However it is possible to obtain paediatric facemasks of different sizes. Try to fit one of these on the child if possible. Connect the generator to the facemask however if possible it would be better to reduce the flow rate to about 300ml/min. If all else fails we have even simply held the generator output line adjacent to the mouth and nostrils of the baby.

It is often easier, or only possible, to image the child or baby lying supine with the camera underneath or even with a baby directly on the camera collimator face (cover the camera with plastic and a blanket before doing so and ensure that the camera cannot tilt and the baby is secure.Try and get the parents to hold the child still if necessary. Immobilisation devices are available. Often a sandbag either side of the infant will be sufficient to minimise movement.  It is important to use a fan placed to blow any leaking Kr81m gas away from the camera face.

All standard views can be obtained with the camera underneath the child, with supine and prone imaging. This avoids any distress of the child due to the camera being directly over them.  Zoomed views (probably x2) on 128x128 matrix should be used. Total counts will depend very much on the response of the child to the imaging procedure, but 150k - 200k should be sufficient.

Although a dual energy procedure would speed things up, a paediatric lung study is always going to be difficult to interpret, with smaller structures to visualise. Therefore the better quality perfusion images obtained using separate Tc99m and Kr81m views is preferred.




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Last modified: November 29, 2002