With the successes of CT dose reduction programs such as Image Gently [1] and Image WiselyTM 2], many organizations have signed n to these programs, and CT proocols across the country have been djusted to match CT dose to the mage quality necessary for a given iagnostic examination. Most of he protocols call for lower doses ompared with the technique in use reviously to scan patients, again n the basis of obtaining sufficient mage quality to allow a diagnosis o be made. With the increased meia attention to CT protocol errors nd misadministrations using highose CT techniques and the inreased frequency of physicians’ orering CT studies to obtain diagnoses, here has been a plethora of articles sugesting CT dose reduction strategies in he recent literature [3-6]. Although CT dose reduction strtegies have been used across the ountry in response to these efforts, hey may not apply to all patients ho require CT scans for their medcal conditions. In particular, patients resenting for CT scans for radioherapy planning may not benefit rom the extremely reduced dose trategies. These patients will have igh-energy x-radiation (an order of agnitude greater than what is reeived with imaging) through the rea being scanned for planning puroses (about 10-80 Gy), and the CT ose (about 1-100 mGy) presents nly a small fraction of the dose the atients will receive to control their disease. In fact, the new techniques in radiation oncology will use further low-energy imaging techniques to align patients during their radiotherapy procedures (“image-guided radiation therapy”). Hence, as mentioned, the CT planning doses will not be of great concern to these patients and their attending radiation oncologists. From the viewpoint of obtaining sufficient image quality for the myriad radiotherapy planning procedures in use today, radiology and radiation oncology department staff members should consult with the attending radiation oncologist to adjust CT scan protocols to obtain sufficient CT image rendition for the planning procedure at hand. This may require an actual increase in CT scan technique from that used for reduced-dose diagnostic techniques. This is especially important when using CT imaging for planning whose image sets will be fused with those from other imaging modalities, such as MRI or PET/CT, to allow the radiation oncologist to accurately contour the tumor targets that will be the subject of the radiotherapy procedure. Image fusion requires matching anatomic regions in both the CT image set and the MRI data, for example, to attack intracranial tumors that are more visible on the MRI data sets. If the CT data set for this fusion is suboptimal (“noisy”) because a reduced-dose CT technique was used, the image fusion may not be rendered accurately,