Linac - Study guides, Revision notes & Summaries

Co-60 dmax - 0.5cm 6x dmax - 1.5cm 10x dmax - 2.5cm 18x dmax - 3.5cm % attenuation in water for: 6MV 10MV 18MV - 6MV=3%/cm 10MV=2.5%/cm 18MV=2%/cm Electron attenuation in AIR - 2%/cm 105 to 110 SSD change in output ~10% Electron attenuation in WATER and LEAD - 2MeV/cm for Water 2MeV/mm for Lead Electron range in Cerrobend compared to lead - 1.2xPb Photon contamination of electrons for 6E 12E 20E - 6E=1% 12E=2% 20E=5% Tissue Density for Lung Fat Muscle B...

inter-fractional uncertainty - have to do with variations in set up that exist between each setup. Ex: weight loss, bloating, tumor changes, or setup errors intra fraction motion - the change in target position during treatment delivery as might occur in the thorax with respirations. surface guided radiation therapy (SGRT) - Technology that uses an optical surface scanning system to track a patient's 3-D surface in real-time adaptive radiation therapy - online or offline planning during ...

When a missing tissue compensator is used, it should be placed: a. directly on the skin surface b. at some distance from the skin surface c. on the end of an electron cone d. on top of a bolus material at iso - Answer-At some distance from the skin surface All of the following are signs of ovarian cancer except: a. vaginal bleeding b. abdominal bloating c. constipation d. nausea - Answer-Vaginal bleeding While treating a patient with painful boney metastasis, it is desirable to: a. el...

How to make tangent beams coplanar correct answer: Divergence = arctan((0.5 * width)/distance)) e- density correct answer: e- density = (density*Na*Z)/Aw Percent photon contamination of e- beam with Energy correct answer: [6e = 1 ....... 20e = 5] * 0.6% Virtual e- source distance calculation correct answer: (Rdg@SSD100cm/Rdg@SSDother) = ((VSD+dmax+gap)/(VSD+dmax)) Pixel Dimension & Line Pairs per cm correct answer: FOV/Pixels per FOV & 1/(2*Pixel Dimension) Image data labels ...

CALP EXAM WITH ACTUAL QUESTIONS AND CORRECT VERIFIED ANSWERS|ALREADY GRADED A+ tilde - <<ANSWER>>waving line placed over a vower before "r" in a combination to indicate unaccented syllable

Nichole’s Math Board Review Exam - Questions, Answers and Explanations A patient treatment with 2 fields separated by 120 degrees, likely needs a ____ degree wedge inserted for even dose distribution. 30 degrees Use the hinge angle formula. A patient is treated using the SAD technique on a 100cm isocentric linac. The field size is 24 x 20. The iso is located 5cm below the patient's skin surface. What does the field measure on the patient's skin? 23 x 19 Use direct proportion. Adjacent field...

The appropriate personnel protective equipment for the care of a patient with suspected TB would be: - Answer-respiratory mask The TD5/5 for the whole brain is: - Answer-45 Gy in 25 fx The histopathological type found most commonly in the neck is: - Answer-squamous cell carcinoma The transporter of oxygen in the blood is the: - Answer-hemoglobin The linear attenuation coefficient (µ) is expressed in: - Answer-1/cm Arrange the following X-ray energies in order of increasing PDD penetration...

Know how to acquire TBI Off Axis Measurements correct answersMeasure OAR at extended distance in phantom Magnify and scale: chamber or film difference between TBI and TMI correct answersTBI target is whole body, TMI is the skeleton with a margin TBI uses low energy x-rays, TMI is treatment with tomotherapy TMI has less toxicities prescription point for TBI x-rays correct answersUmbilicus Know about isocentricity for SRS and SRT correct answersWithin a sphere radius of 1mm Can be mec...

CMMB 561 Final Exam Actual Questions and Answers with complete solution What are some early uses of radiation? - answerTo find bullets on the battefield for soldiers, to treat certain diseases BiTEs vs BiKEs vs TriKEs - answerBiTEs: bi-speciifc T cell engager - has one of the scFVs targeting CD3 on the TCR to engage the T cell BiKEs: bi-specific NK cell engages - has one of the scFVs targeting CD16 on the NK cell receptor TRikEs: tri-specific NK cell engager.. - has an additional IL-15 ...

___ energy does NOT have sharper penumbra - ANSWERLower Edge of the field represents - ANSWER50% idodose line Which is more difficult to measure 4X4 or 20x20 field size? - ANSWER4x4 because penumbra region is larger Cobalt machine has larger penumbra than LINAC because - ANSWERLarger source size Field size defined at intersection - ANSWER50% isodose line Increase SSD, _________ penumbra? - ANSWERincrease wedge factor, ____ Mu? - ANSWERIncrease Wedge angle - ANSWERangle of ...