Rads is an interesting field. The USMLE score is pretty high (240ish) but there are also a lot of spots (1100) compared to other competitive specialties which are usually 300 or less spots (except ortho which has like 700).
Basically, a D.O. can expect to match rads but usually will not match at a top 50ish program.
There was a person that made an unofficial "ranking" and here's top 50 and the ones in the top 50 that take D.O.s highlighted in bold (
http://forums.studentdoctor.net/threads/ultimate-radiology-rankings.1127962/)
1. MGH 26 points
2. Johns Hopkins 25.75
3. Mayo - MN 25.5
4. UCSF 25
5. Duke 24
6. MIR 24
7. UPMC 24
8. Penn 23.5
9. Stanford 23.25
10. UCLA 22.25
11. BWH 21.75
12. Michigan 21.75
13. CCF 21.75
14. UCSD 21.5
15. NYP - Cornell 20.75
16. Emory 20.25
17. Univ. of Wash 19.75
18. NYU 19.75
19. NYP - Columbia 19.25
20. Indiana 18.5
21. Yale 18
22. Wisconsin 17
23. Wake Forest 16.75
24. Northwestern 16.75
25. Iowa 16.5
26. Vanderbilt 16.5
27. Thomas Jefferson 16.25
28. USC 14.75
29. UAB 14.75
30. Virginia 14.25
31. UT-Houston 14
32. Case Western 14
33. UTSW 13.5
34. Oregon 12.75
35. Colorado 12.25
36. UC-Davis 11.75
37. Utah 11.25
38. Dartmouth 11.25
39. Maryland 10.75
40. Med Coll. WI 10.75
41. MUSC 10.25
42. Beaumont 10
43. Cincinnati 9.75
44. Cedars-Sinai - LA 9.75
45. Univ. of Chicago 9.75
46. BID 9.25
47. Minnesota 9.25
48. Arizona 9
49. Baylor Univ. 8.5
50. North Carolina 8.5