I'm just reaching the end of my first year as a radiography student and have found that this book was quite useful. The information is very broad - which is a good thing in this case. There is information available on legislation (Which Universities are massive on when it comes to referencing within an essay), techniques, procedures and ethics regarding patient care.
It is structured well so that every aspect is easy to find and each topic is described in enough detail so that new information is still understandable. I wouldn't say that this textbook would be that useful for a second or third year student unless they are in need of legislation and ethics information as the detail is a little limited.
I found myself using this book in all of my assignments this year and I imagine I will do the same next year when new topics are introduced. It really depends on how much background knowledge you already have - if you have none or only a little this is ideal. I can imagine for those people already working within a radiology department will have alot of the knowledge already. Even so, referencing what you know is essential so this book is quite integral to a radiography student.
I would recommend it without question, it has been more than useful for me.