It is very subjective and these are my preferences. Recommended books: 1- Neuro: Requisites. Heard new Osborn book is on its way. Don't know about it, but should be good. 2- MSK: Requisites. MSK MRI by Kaplan. 3- Body: Webb body CT. Fundamental of Body MRI by Roth: came after my residency junior years, but seems good one. For body MR and even body CT I have not found a very good book yet, but there are tons of excellent articles in radiographics. 4- Chest: Essentials by Collins then thoracic imaging by Webb. 5- US: Requisites. 6- IR: Hand book by Kandarpa 7- Peds: The one by Donnely. 8- Nucs: Mettler. 9- Case Review Series are also great. There are tons of other excellent books you can buy for each subject. I am not a fan of Brant and Helms even for start. It is very superficial and yet very disorganized. It emphasize on some unimportant points and yet does not talk about some very important ones. Nothing beats reading a good number of different low and high end studies during residency and reviewing them with subspecialized attending. Don't underestimate subspecialists in your field.