## 2 Experimental Section  
A simple single loop coil of diameter 24.5 mm was produced using silver coated nylon yarn embroidered using a stitch length of 0.2 mm on a Barudan BEVT-Z1501 CB digital embroidery machine modified to minimize the damage to the delicate yarn during application. This was embroidered onto a woven cotton fabric and protruded 1.1 mm either side of the cotton layer giving a coil resistance of 9.2 \(\Omega\). A number of different designs were investigated however all these exhibited much higher resistance values (reducing the maximum achievable quality factor) and did not result in a sufficient impedance match at the required frequency. A photo of the selected design is shown in Figure 2 along with photographs of its use for measurements. Figure 2: **(a)** Photograph of the embroidered coil; **(b)** The coil flat on the NMR MOUSETM; **(c)** Embroidered coil conformed to palm oil tub; **(d)** The coil and tub on the NMR MOUSETM from the front, and **(e)** the side. The coil, tuning and matching capacitors were connected to a network analyzer (Agilent E5061A) that scans through the frequency range of interest showing the resonant properties of the circuit. Figure 3 shows the data for the fabric coil with a broad resonance centered at 10.64 MHz. The commercial magnetic resonance instrument used in this work was the ACT (Aachen) profile NMR MOUSETM [18] with a CAT-20 Apollo (Tecmag, Houston, TX, USA) console to provide pulse sequence generation and signal processing with a Tomco (Stepney, Australia) BT00250-Beta 250 W power amplifier. The instrument operates at a frequency of 10.64 MHz and uses the same coil for excitation and detection. The system is unilateral and provides a uniform magnetic field (which defines the sensitive volume being interrogated by the system), 5 mm above the top surface and with dimensions \(5~{}\upmu\mathrm{m}\times 30~{}\mathrm{mm}\times 30~{}\mathrm{mm}\). The resonance curve for the built in coil on the MOUSETM is also shown in Figure 3. The much sharper resonance would be expected to deliver energy much more efficiently to the sample than the broader resonance of the fabric coil. For this particular application however, the broad resonance is advantageous in that changes in the shape of the coil when it conforms to the object being measured do not cause much variation in the tuning of the circuit. The loss in matching is predominantly due to the increased resistivity of the fabric coil compared to that of the NMR MOUSETM. It may be possible to improve this by using a different yarn although that has not been explored as part of this work. The Carr Purcell Meiboom Gill (CPMG) [19] sequence was used to measure \(\mathrm{T_{2}}^{\mathrm{eff}}\), as is typical on unilateral instruments, with a saturation recovery sequence used for the determination of T1 [20]. The parameters used for these sequences are detailed in Table 1. Prior to these measurements a series of Carr Purcell Meiboom Gill (CPMG) sequences with increasing 90 degree pulse length were run to find the maximum signal and hence the optimum time for the 90 degree pulse; this was found to be 6000 ns and was significantly longer than the 4500 ns for the MOUSETM coil (for the same RF transmit power of 250 W) as expected given the lower quality factor and the difference in the geometry of the coils. Figure 3: The resonance curves for the fabric coil probe (red line) and the NMR MOUSETM probe (blue line). The longer pulse length will also result in a slight reduction in the volume of the selected slice due to the reduction in the bandwidth. The test samples used were sunflower oil and red palm oil. For investigating how well the fabric conforms to different surfaces and how this affects the measurements, a tube was used filled with red palm oil with a diameter of 8 cm. Wrapping the coil round the 8 cm tube, resulted in no measureable change in the frequency at which the minimum occurred in the resonance curve on the network analyzer.