How can loop through a image folder?

New to Julia
6

I have a folder full of fits images. I would like to iterate through each image in file. I already write this code. I would like to improve it. please help.

DISK = glob("SyntheticData/int_a_*.fits")
Iu = Array{Float64,3}[]
Ip = Array{Float64,3}[]
Theta = Array{Float64,3}[]

it = 1
for DISKS in DISK
    Iu[:,:,it] =gain .* DISKS[:,:,1];
    Ip[:,:,it] =gain .* DISKS[:,:,2];
    Theta[:,:,it] =DISKS[:,:,3];
    global it+=1;
end
end