* have not undergone gene therapy or a bone marrow transplant
* are not receiving chronic transfusions
* have not received a blood transfusion in the past 3 months
Group 3 (SCD patients who have undergone gene therapy):
SCD patients ages 8-18 who have had gene therapy at least one month prior to enrollment
Group 4 (SCD patients who have chronic transfusions):
SCD patients ages 8-18 who receive chronic transfusions
You may not be if
Electrical implants such as cardiac pacemakers or perfusion pumps;
Ferromagnetic implants such as aneurysm clips, surgical clips, prosthesis, artificial hearts, valves with steel parts, metal fragments, shrapnel, tattoos near the eye, or steel implants;
Ferromagnetic objects such as jewelry or metal clips;
Women of childbearing age who are seeking to become pregnant, who are breastfeeding, or who suspect they may be pregnant;
Pre-existing medical conditions including a likelihood of developing seizures or claustrophobic reactions;
Any greater than normal potential for cardiac arrest;
