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Q1) How many Joules per second would a 1W laser produce
A1) 1J/s
Q2) How many total Joules would this 1W laser output in 5 minutes?
A2) 60 x 5 = 300 so 300 Joules
Q3) How do we calculate irradiance?
A3) Power output (w) ÷ spot size or beam area (cm2)
Q4) Have a go at calculating this dose. We are aiming for a therapeutic dose of 6J/cm2 – the area we want to treat is 200cm2
How many total joules would we need to deliver to reach the therapeutic dose that is right for that size area?
A4) 6 x 200 = 1200 total joules
Q5) If we treated an area of 100cm2 with a total of 1500J what is the energy density (J/cm2)?
A5) 1500 ÷ 100 = 15J/cm2
Q6) Is the irradiance higher, nearer to the source of power (eg: PBM delivery head) or further away? Explain your answer.
A6) The irradiance is higher, nearer to the source as this is where the spot size would be smaller (same power output but more concentrated). This is important because, if the spot size is calculated in contact with the skin and then you need to move the head further away from the skin, for reasons such as its too painful or there is a risk of contamination, you must be aware that this will change the spot size and therefore the irradiance and ultimately the total dose being delivered.
Q7) What is the accepted therapeutic dose range for superficial penetration with PBM?
A7) 4 – 5 J/cm2
Q8) What is the accepted therapeutic dose range for deeper conditions?
A8) 8/20 J/cm2
Q9) According to Zein, Selting and Hamblin’s 2018 review, what are the two most important measures when determining the success of an in vivo study?
A9) Fluence and Irradiance
Q10) What patient specific variables need to be considered when calculating dose?
A10) Size, body condition, hair and skin colour and skin length.
Q1) How many Joules per second would a 1W laser produce?
This response will be reviewed and graded after submission.
Q2) How many total Joules would this 1W laser output in 5 minutes?
This response will be reviewed and graded after submission.
Q3) How do we calculate irradiance?
This response will be reviewed and graded after submission.
Q4) Have a go at calculating this dose. We are aiming for a therapeutic dose of 6J/cm2 – the area we want to treat is 200cm2
How many total joules would we need to deliver to reach the therapeutic dose that is right for that size area?
This response will be reviewed and graded after submission.
Q5) If we treated an area of 100cm2 with a total of 1500J what is the energy density (J/cm2)?
This response will be reviewed and graded after submission.
Q6) Is the irradiance higher, nearer to the source of power (eg: PBM delivery head) or further away? Explain your answer.
This response will be reviewed and graded after submission.
Q9) What is the accepted therapeutic dose range for superficial penetration with PBM?
This response will be reviewed and graded after submission.
Q8) What is the accepted therapeutic dose range for deeper conditions?
This response will be reviewed and graded after submission.
Q9) According to Zein, Selting and Hamblin’s 2018 review, what are the two most important measures when determining the success of an in vivo study?
This response will be reviewed and graded after submission.
Q10) What patient specific variables need to be considered when calculating dose?
This response will be reviewed and graded after submission.