Adjustable helmet for use with optically-pumped magnetometer

A helmet system, comprising:

• a helmet comprising a helmet base comprising more than one section, each section movable in relation to another section;
• at least one locking system connecting two of the sections of the helmet base, the at least one locking system comprising an adjustable mechanism to adjust spacing between the two sections;
• at least one sensor holder on the helmet base;
• and
• a sensor positioned in each of the at least one sensor holders.

A helmet for use with a neural imaging machine, comprising:

• a helmet base comprising more than one section, each section movable in relation to another section;
• at least one locking system connecting two of the sections of the helmet base, the at least one locking system comprising an adjustable mechanism to adjust spacing between the two sections;
• and
• at least one sensor holder on the helmet base, the at least one sensor holder configured to hold a sensor of the neural imaging machine;
• wherein the at least one locking system comprises more than one preset and defined location in which to space the two sections.