In Taoist alchemy, Qi (Jing Qi) must be refined in order for it to be of use for higher level self-healing.
This refinement happens in the lower Dantian, where (from my experience) it seems to steam upwards from the dantian after it is refined, expanding upward to fill every nook and cranny.
I also have come across forms which are mean to take in external Qi in larger quantities than usual, directly from the ambiant environment.
However it feels as though the quality of this Qi is more "raw" and brought me to wonder, is this Qi useable in that state, or must it also be refined before it becomes "useful" energy.
I suppose the same question could be applied to Qi healing for others. If external Qi (from the ambient environment) is directed towards the patient, is it directly useable? Or must it be refined by the patient's Dantian before is is of any use to them?