Keywords are common use terms. You've probably seen them in textbooks or used them when talking with classmates.
It is okay to use Google or Wikipedia to find keyword terms since you're looking for terms that people commonly use. If you're only using them to search (and not incorporating it into your assignment), you won't need to cite Google or Wikipedia as a source.
Brainstorm keywords and technical terms to use in your search before you start searching in databases
Positron Emission Tomography OR PET
(You don't need to put OR in capitals, but it makes it easier to differentiate between the two terms.)
MeSH = Medical Subject Headings (specific medical terminology)
Many medical databases use these MeSH terms as consistent wording. Instead of using a bunch of different words to describe the same thing, they use one word consistently.
Look up the MeSH term for thyroid cancer using Medline:
You'll find that "thyroid neoplasms" is the term they use. Check it off, hit "Search Database" and it'll pull up everything they have on the topic.
Tip: Put one idea (and its variant terms) per line. It keeps things organized.
In many databases, an asterisk * is a wildcard operator.
Diagnos* will find diagnostic, diagosis, diagnoses, diagnosing
(Use it wisely - if you try using diag*, you'll also get diagonal and diagram)
Use MeSH to structure your search by using two search features:
Explode = includes all the "smaller" terms nested under the subject heading in your search
For example, exploding "Thyroid neoplasms" will include etiology, genetics and other narrower aspects of the subject
Major concept = only finds articles where this subject heading is a major point of the article
What are the advantages and disadvantages in using PET to diagnose thyroid cancer?
Key parts: PET, thyroid caner, diagnosis
I've heard people talking about PubMed - what is it?
PubMed (free) and Medline (subscription-based) search almost (98%) the same pool of data and research.
The Libary pays for Medline because it's user friendly and allows you to make use of MeSH. Many employers, including AHS, subscribe to Medline.