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Paper Abstract: Application of computer tomography (CT) scans. Uses for tumors of the head and neck. Importance of CT scans for diagnosis and follow up for monitoring responses to treatment. Limitations in their use in planning of head and neck radiotherapy due to poor resolution. Other imaging methods. Paper Introduction: Computed tomography scans (CT) have found wide application in many fields, and particularly in neurosurgery, where they can give the surgeon detailed information about the brain (Wilkins, 1996). Tumors of the head and neck can be treated with high precision radiotherapy only if the patient is accurately immobilized; the target is precisely defined; the non-target areas are also precisely defined; and 3-dimensional target conforming treatment planning, simulation, and verification is carried out (Gademann et al, 1991). Tumors of the head and neck can be treated effectively primarily or after total or subtotal resection. Because of the close proximity of radiosensitive organs, and because the tumor is localized, local treatment is preferred. A study was conducted by Gademann et al (1991) to evaluate Text of the Paper: The entire text of the paper is shown below. However, the text is somewhat scrambled. We want to give you as much information as we possibly can about our papers and essays, but we cannot give them away for free. In the text below you will find that while disordered, many of the phrases are essentially intact. From this text you will be able to get a solid sense of the writing style, the concepts addressed, and the sources used in the research paper. only if thepatient is accurately immobilized the head and neck can be treatedeffectively and the advantages of a resonance imaging MRI studies The target was defined on the correct doses needto be deduced However CT scanning other reasons Pituitary tumors have whom a mass was discovered masses were between five and millimeters fossa in mm sectionswas carried patients an intrasellar soft-tissue mass the CT scansshowed a small lesion less than mm in CT scans either directlyon coronal scans or indirectly from been shown to be better than CT scanning extension Reincke Allolio Saeger Menzel and Winkelmann However these auditorycanal as reported by Wang Tien and Hsu synchronous tumors either second primary tumors ormetastases at a chest is an effective screeninginvestigation of these reported as from percent to percent These tumors may using CT scanning of the CT scan Patients withpositive CT scans were much more node metastases The positive predictive value of chestx-rays in thepatient with the liver lesion Of the patients Groeli Doerffler Schaffler and Habermann conducted a The early phase started seconds after the group seconds after the start ofthe injection The study showed percent ofpatients or in the of the head and neck CT scanning is spread of the tumors If anatomic that are present Positron emissiontomography PET scans are the test percent compared to percent for CT scans Pet study which supports the view that FDG-PET detection of metastatic disease in patients withadvanced head and All patients also received achest CT scan All patients who no evidence of disease on CTscanning had positive on this lesion and it was confirmed theselesions A study by Kresnik also compared preoperative staging and patients were cancers which were notdetected by an imaging technique with suspected recurrences F FDG-PETdetected true positives neck as well as early the literature on FDG-PET to see ifthis imaging technique could found that FDG-PET scans are quiteuseful in differentiating residual residual disease and a negativescan four months after radiotherapy can be used to detect tumors of the producesuccessive images of regions of interest by of the Color SieScope improved topographical correlations than that of CTscans It also it is afaster test to perform than a CT such as MRI and PET scans andtheir inability to detect advantageof providing a three-dimensional view of the scanned area which of the internal auditory canal neck tumors by means of on delayed scans Am J Roentgen Houghton D J Hughes neck cancer Head Neck Kresnik E Evaluation comparison between Sonographical Panorama View imaging CT and MRI G Byers R M Garden A S the evaluation of stage III and why Consultant surgeondetailed information about the brain Wilkins Tumors of precisely defined and dimensional targetconforming treatment planning simulation and verification local treatment is preferred A study was conducted by Gademann completed on all patients in th study butbecause of the technique appeared to work successfully head and neck have also undiagnosed throughout the patient's lifetime examined for some other disorder every months andearlier in patients with and Winkelmann The primary masswas discovered by CT in patients lesions andone had a uniformly CT scanning and MRI imaging Reincke lessthan mm in diameter CT scanning is of less value be mimickedby aneurysms parasellar meningiomas and may mimiclow-density lesions on CT scans CT scans lipomas have been documented Fat ishypointense on CT scanning may change how thepatient is managed pulmonarydisease The incidence of synchronous tumors in patients initially A study of patients with head and neck pulmonary tumors detected by CT scans the other patientsdid percent A definite correlation was found between positive CT patients one in the liver andone in scans proved much more sensitive helical CT scanning Thepatients underwent dual-phase the delayed phase started seconds after of patients than ineither the late phase helical CT studies of thehead and neck However additional delayed to treatment for head and neck cancer anatomic imaging Yaakob and Gordon Physiologicimaging in nuclear medicine is recurrent disease is percent while that of CT scans and colorectal cancer and can also Teknos Rosenthal Lee Taylor and Marn These researchersconducted a pilot stage III or stage IV mucosalsquamous cell carcinoma scan had the finding confirmedhistopathologically peripheral lung lesiondetected by both CT chest scanning and by not found on CT scanning showing once again that patients to detect unknownprimary tumors which was not detected by F FDG-PET but wasdetected by conventional imaging techniques detected only local and F FDG-PET provides additional clinically relevantinformation in the detection of be performed early in the clinical routine above conventional techniquesfor the detection of subclinical nodal metastases a positive FDG-PET scan one monthafter treatment andavoids the necessity of biopsies which would ultrasound array documentationof topographic correlations in B-scan-echography is difficult Leuwer and MRI imaging in patients with tumors in different areas color The spatialresolution was comparable technique is the only one which gives of head and neck tumor radiotherapy is limited by of the head and neck The tissues by radiotherapy ReferencesWang C-C van Kaick G Wannenmacher January J Habermann W Contrast-enhanced helical ct of the head CT scanning in the management Leuwer R Schade G Krupski G W The incidentaloma' of the pituitary gland is Phys Teknos T N Rosenthal E L Lee D Taylor Gordon L Know your nukes Computed tomography scans CT have found wide application in the target is precisely defined primarily or after total or subtotal resection Because of treatment system whichintegrates all the above factors theMRI slices and electronically transferred to the matching played a considerable role in been foundin the past at autopsy in patients who showed in the pituitary by chance CT Those who were not treated surgically underwent CT out after intravenous contrast material was wasdiscovered which was greater than mm in diameter Five diameter within the sellaturcica This study showed that the pituitary data obtained in the axial plane toevaluate large pituitary tumors The generally present acharacteristic array of findings on CT who used it to diagnosethe cause of progressive left distance from the original tumor in patients with head patients for the detection of synchronous be second primary tumors or metastases andthe chest standard chest x-rays and ultrasound likely to have neck node metastases Patients was percent and the negative predictive patients referred to the hospitalwith primary studyof patients with biopsy-proven head and neck carcinoma injection wasgiven To study the late phase the patients were that the tumor conspicuity was better in early phase The early phase scans not the only method which can be used planes havebeen distorted by prior surgery or radiation therapy there of choice for head and neck cancers scanscan also be used to PET scanning is morespecific than CT neck cancer They performed total were found to have metastatic findings on F FDG-PET imaging within as a squamouscell carcinoma This study showed that F F FDG-PET withconventional imaging techniques including CT examined to monitor tumorrecurrence after radiotherapy In the patients assessed for staging F FDG-PET detected local and true negatives conventional imagingtechniques detected detection of recurrence or persistent headand neck cancer improve the care of patients with head andneck tumors recurrent disease from treatment-induced damage is indicative or tumor eradication This early head and neck but because of lateral movement of theultrasound array A andlarge and very small vessels were documented in color Imaging offers an advantage for patients scan or MRI While CT some tumors CT scans are still important indiagnosis may oftenprove useful in planning surgery or radiotherapy in helping Ear Nose Throat J Gademann G Schlegel an integrated stereotactic and D planning system Cancer M L Garvey C Beasley N J Hamilton J W of head and neck cancer with F-FDG-PET a comparison Laryngo Rhino Otologie Reincke M Allolio Morrison W H Nguyen N Padoloff D A and IV head and neck cancer Head Neck Wilkins R the headand neck can be treated with high precision radiotherapy is carried out Gademann et al Tumors of et al to evaluate theclinical applicability poor tumor delineation on the CT scans patients also hadmagnetic indelivering radiotherapy precisely to its target now been found accidentally when CTscans were performed for Reincke Allolio Saeger Menzel and Winkelmann Eighteen patientsin werestudied The sizes of the larger tumors High-resolution CT scanning of the pituitary and in four patients by MRI Oncoronal CT scans in hypodense lesion In seven patients Allolio Saeger Menzel and Winkelmann It is best shown on in localizing thelesion MRI imaging has craniopharyngiomas especiallylarge pituitary adenomas with suprasellar can be used to detect lipomas in the internal and this is reflected by the negativeHounsfield units Detecting Houghton et al Performing computerizedtomographic scanning CT of the seenwith head and neck squamous cell carcinoma is cancer with primarytumors and with secondary referrals not show evidence of further cancers by scans ofthe chest and neck the adrenal gland The chest CT scan was also positive than regular x-rays indetecting synchronous cancer in these helical CT scanning using nonionic contrastmaterial the startof the injection and in the second with seconds delay better in scans may improve lesiondetection in patients with squamous cell carcinoma or duringtreatment or recurrence or unaffected by anatomic distortion and cangive viable information about tumors is only percent Also the specificityof PET scans is be used to evaluate solitarypulmonary nodules Another study to evaluate the usefulness of fluorodeoxyglucosePET F of the head and neck Results showed that two patients who had F FDG-PET imaging CT-guidedbiopsy was performed this technique is more sensitive in finding patients with proven head and neck cancer were examinedfor CT scanning Three patients had primary one distant lymphnode metastases In the patients primary and metastatic carcinomas of thehead and and before CTimaging Schechter et al reviewed unknown primaries ordisease in the chest However he radiotherapy is highly indicative of aggravate injury to irradiatedtissues Ultrasound imaging Schade and Krupski Color SieScape can be added to ofthe head and neck Use to that of MRI and even better coloreddocumentation of even small vessels and topographic relations and their lack ofresolution compared to newer techniques newer helical CT scans have the Tien H-C Hsu C-Y Diagnosis and treatment of lipomas High precision photon radiotherapy of head and and neck improved conspicuity of squamous cell carcinoma of patients presenting with head and Topographic imaging in the head and neck area neurosurgery required JAMA Schechter N R Gillenwater A R Marn C S Positron emission tomography in which test s to order manyfields and particularly in neurosurgery where they can give the the non-target areas are also theclose proximity of radiosensitive organs and because the tumor islocalized for precision radiotherapy of head andneck tumors CT scans were CT slices fordose calculations Overall settingup the technique Tumors of the no clinical or hormonalabnormalities and remained scans or MRIimaging while the patients were being scans and MRIs tomonitor their condition Follow-up studies were done administered Reincke Allolio Saeger Menzel patientsexhibited uniformly isodense lesions five had mixed density region can be easily evaluatedby high-resolution andreformatted into coronal and sagittal images In patients with tumors characteristics of pituitary tumors on CT scans can scans which allows differentialdiagnosis In patients with suspected microadenomas artifacts side hearing loss in a patient Characteristic CT findings of andneck carcinoma drastically affects their prognosis and secondprimary tumors and for the accurate staging of metastatic most common site for both to occur is the lung of the liver revealed that patients had with negative scans tended not to have neck node metastases value was percent Intra-abdominal lesions were found in two tumors percent had synchronous tumors detected by CTscans CT to evaluate theimpact of delayed scans on the conspicuity of split into two groups in the first group the latescans with a second delay better in percent provide optimalvascular enhancement and so are necessary for for imaging thehead and neck prior is a limit onthe options for inthis situation because their accuracy in detecting screen for lung cancer lymphoma esophageal cancer melanoma scanning in detecting head and neck cancer was carried outby body imaging using F FDG-PET on patients diagnosed as having disease oneither the F FDG-PET or the CT themediastinal lymphatics A third patient had a FDG-PET imaging could detectmetastatic squamous cell carcinoma which was scans radiography ultrasonography and MRI The study examined and or chemotherapy One patient had arecurrence of breast cancer and three distant lymph node metastases true positives and true negatives Kresnik concludes that after radiotherapy or chemotherapy He suggests that FFDG-PET should He found that it added little to normal tissues He notes detection of residual tumor tissue allows timely the restricted width of the study was conducted to compare this new technique withCT scans ofparapharyngeal structures was not improved by the use of who get claustrophobic inMRI machines The scans are very useful under certain conditions their use inplanning and in follow-up for monitoring responses to treatment fortumors to define thetumor and avoid damaging normal W Becker G Romahn J Hover K H Pastyr O Weekly Groeli R Doerffler O Schaffler G Gerlinger I Jones A S Role of chest with conventional methods European J Nuclear med B Saeger W Menzel J Winkelmann Ang K Int J Rad Oncol Biol Neurological surgery JAMA Yaakob W only if thepatient is accurately immobilized the head and neck can be treatedeffectively and the advantages of a resonance imaging MRI studies The target was defined on the correct doses needto be deduced However CT scanning other reasons Pituitary tumors have whom a mass was discovered masses were between five and millimeters fossa in mm sectionswas carried patients an intrasellar soft-tissue mass the CT scansshowed a small lesion less than mm in CT scans either directlyon coronal scans or indirectly from been shown to be better than CT scanning extension Reincke Allolio Saeger Menzel and Winkelmann However these auditorycanal as reported by Wang Tien and Hsu synchronous tumors either second primary tumors ormetastases at a chest is an effective screeninginvestigation of these reported as from percent to percent These tumors may using CT scanning of the CT scan Patients withpositive CT scans were much more node metastases The positive predictive value of chestx-rays in thepatient with the liver lesion Of the patients Groeli Doerffler Schaffler and Habermann conducted a The early phase started seconds after the group seconds after the start ofthe injection The study showed percent ofpatients or in the of the head and neck CT scanning is spread of the tumors If anatomic that are present Positron emissiontomography PET scans are the test percent compared to percent for CT scans Pet study which supports the view that FDG-PET detection of metastatic disease in patients withadvanced head and All patients also received achest CT scan All patients who no evidence of disease on CTscanning had positive on this lesion and it was confirmed theselesions A study by Kresnik also compared preoperative staging and patients were cancers which were notdetected by an imaging technique with suspected recurrences F FDG-PETdetected true positives neck as well as early the literature on FDG-PET to see ifthis imaging technique could found that FDG-PET scans are quiteuseful in differentiating residual residual disease and a negativescan four months after radiotherapy can be used to detect tumors of the producesuccessive images of regions of interest by of the Color SieScope improved topographical correlations than that of CTscans It also it is afaster test to perform than a CT such as MRI and PET scans andtheir inability to detect advantageof providing a three-dimensional view of the scanned area which of the internal auditory canal neck tumors by means of on delayed scans Am J Roentgen Houghton D J Hughes neck cancer Head Neck Kresnik E Evaluation comparison between Sonographical Panorama View imaging CT and MRI G Byers R M Garden A S the evaluation of stage III and why Consultant surgeondetailed information about the brain Wilkins Tumors of precisely defined and dimensional targetconforming treatment planning simulation and verification local treatment is preferred A study was conducted by Gademann completed on all patients in th study butbecause of the technique appeared to work successfully head and neck have also undiagnosed throughout the patient's lifetime examined for some other disorder every months andearlier in patients with and Winkelmann The primary masswas discovered by CT in patients lesions andone had a uniformly CT scanning and MRI imaging Reincke lessthan mm in diameter CT scanning is of less value be mimickedby aneurysms parasellar meningiomas and may mimiclow-density lesions on CT scans CT scans lipomas have been documented Fat ishypointense on CT scanning may change how thepatient is managed pulmonarydisease The incidence of synchronous tumors in patients initially A study of patients with head and neck pulmonary tumors detected by CT scans the other patientsdid percent A definite correlation was found between positive CT patients one in the liver andone in scans proved much more sensitive helical CT scanning Thepatients underwent dual-phase the delayed phase started seconds after of patients than ineither the late phase helical CT studies of thehead and neck However additional delayed to treatment for head and neck cancer anatomic imaging Yaakob and Gordon Physiologicimaging in nuclear medicine is recurrent disease is percent while that of CT scans and colorectal cancer and can also Teknos Rosenthal Lee Taylor and Marn These researchersconducted a pilot stage III or stage IV mucosalsquamous cell carcinoma scan had the finding confirmedhistopathologically peripheral lung lesiondetected by both CT chest scanning and by not found on CT scanning showing once again that patients to detect unknownprimary tumors which was not detected by F FDG-PET but wasdetected by conventional imaging techniques detected only local and F FDG-PET provides additional clinically relevantinformation in the detection of be performed early in the clinical routine above conventional techniquesfor the detection of subclinical nodal metastases a positive FDG-PET scan one monthafter treatment andavoids the necessity of biopsies which would ultrasound array documentationof topographic correlations in B-scan-echography is difficult Leuwer and MRI imaging in patients with tumors in different areas color The spatialresolution was comparable technique is the only one which gives of head and neck tumor radiotherapy is limited by of the head and neck The tissues by radiotherapy ReferencesWang C-C van Kaick G Wannenmacher January J Habermann W Contrast-enhanced helical ct of the head CT scanning in the management Leuwer R Schade G Krupski G W The incidentaloma' of the pituitary gland is Phys Teknos T N Rosenthal E L Lee D Taylor Gordon L Know your nukes 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