This study requires credentialing before patients can be entered onto this study. The credentialing requirements are different depending on whether you are using a 3D-CRT or IMRT technique. You can be credentialed for either technique or for both depending on your physician's treatment preference.

In order to complete the 3D-CRT credentialing process the following items must be completed:

• All participants are asked to complete and fax/e-mail the Facility Questionnaire to RTOG at 215-940-8817 or rtog-facquest@phila.acr.org. Questions about the questionnaires can be directed to Tammy McGlade at 215-574-3219.

  In order to complete the IMRT credentialing process, the following items must be completed:

• All participants are asked to complete and fax/e-mail Facility Questionnaires to RTOG at 215-940-8817 or rtog-facquest@phila.acr.org.

• Electronic submission of the phantom is acceptable as the dry run test to the ATC.

• Irradiate the IROC Houston's lung phantom using an IMRT technique. Please fill in the request form online

Note:

• Institutions that have been successfully credentialed for prior RTOG lung studies will automatically quality for this study using the same delivery technique (3D-CRT vs IMRT) as previously credentialed for. If you would like to verify your previous credentialing status, please fill in the Credentialing Status Inquiry Form and someone from the IROC Houston will contact you.

• NCI Guidelines on the use of IMRT in Clinical Trials

Acceptable treatment planning system(TPS) / algorithm