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Ac i i y 1
In oduc ion
The ac i i y aims a in es iga ing he easibili y o using powe measu emen s/ esul s as a subs i u e o
empe a u e measu emen s/ esul s when es ing he hea ing o me allic implan s in line wi h he
p ocedu e ecommended by he ISO/TS 10974:2018 s anda d.
The e alua ions will be ca ied ou conside ing he implan s selec ed in A3.1.1 wi h he only excep ion o
he c anial pla e whose 2D-like shape makes such an analysis less in e es ing (NOTE: we can conside also
he c anial pla e a a la e s age i we deem i is use ul).
I is expec ed ha he ollowing poin s a e in es iga ed in he amewo k o he ac i i y:
1. Fo each implan , he co ela ion be ween he magne ic field di ec ion ha maximises he powe
deposi ion in o he implan and ha ha maximises he empe a u e inc ease a e 5 minu es, 15
minu es and 30 minu es o exposu e;
2. Fo each implan , he co ela ion be ween he powe deposi ed in o he implan and he ollowing
empe a u e inc ease as a unc ion o he magne ic field di ec ion. The co ela ion should be
e alua ed accoun ing o a empe a u e inc ease a e 5 minu es, 15 minu es and 30 minu es o
exposu e;
3. Fo each implan , a coefficien , wi h associa ed unce ain y/confidence le el, ha allows o es ima e
he empe a u e inc ease a e a specified ime ins an gi en he powe deposi ed in o he implan .
NOTE: Wi h e e ence o he 3 d poin , a coefficien can be also in es iga ed wi hou ocusing on a single
implan bu in ol ing hem all. Based on ou p e ious expe ience, he implan su ace u ns ou o be
use ul o no malise he deposi ed powe in o de o imp o e he co ela ion wi h he empe a u e
inc ease.
All he da a o be s udied ha e been ob ained by INRIM h ough a home-made ool and a e p o ided as
.ma files wi h one file p oduced o each implan . Fu he de ails abou he ollowed p ocedu e can be
ound in he WP3 epo uploaded in he STASIS eposi o y.
UPDATE
The da a p o ided a e ele an o he exposu e o he implan s o a homogeneous magne ic field wi h a 1
A/m ampli ude. The ISO 10974 s anda d sugges s o pe o m he g adien induced hea ing conside ing a
magne ic flux densi y o 35 mT. The e o e, i could be mo e meaning ul o epo he esul s o he 35 mT
magne ic flux densi y. Since bo h he powe and empe a u e inc ease a e p opo ional o he squa e o
he magne ic field alue, i co esponds o mul iply all empe a u e inc eases and powe s (x and y axes) by
.
Da a o ma
Each implan is associa ed wi h a ac i i y1_<Implan _name>.ma file con aining he ollowing
a iables:
powe _map : ma ix o he o al powe exp essed in wa deposi ed in o he implan o a
specific o ien a ion o he uni a y ha monic magne ic field exp essed in pola coo dina es.
(0.035/(4
π
)
10
−7
)
2
×
N
θ
N
ϕ
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is he pola angle ( he angle be ween he magne ic field ec o and he z-axis) and
is he azimu h angle ( he angle be ween he magne ic field ec o and he x-axis).
and a e he numbe o and in e als a which he powe has been compu ed;
powe _wo s _H : 3 elemen ec o ep esen ing he uni a y magne ic field ha esul s in he
maximum powe deposi ed in o he implan ;
emp_map_<n>min : ma ix o he maximum empe a u e inc ease exp essed in kel in,
a e <n> minu es o exposu e, o a specific o ien a ion o he uni a y ha monic magne ic field
exp essed in pola coo dina es wi h he same c i e ia used in he powe _map ma ix;
emp_wo s _H_<n>min : 3 elemen ec o ep esen ing he uni a y magne ic field ha esul s in he
maximum empe a u e ince ase a e <n> minu es o exposu e;
ex e nal_su ace : ex e nal su ace o he implan exp essed in squa e me e (i.e., he in e ace
be ween he implan and he backg ound).
θ
: [0,
π
/2]
ϕ
: [−
π
,
π
]
N
θ
N
ϕ
θ
ϕ
×
N
θ
N
ϕ
